Rockman.EXE

Similarities: - They are both sci-fi anime, set in a technologically advanced world. - The two anime deals with human and the virtual net world. Difference: - In Webdiver, the kids pilot the robots to bust the viruses while in Rockman, humans plugged in a program to bust the viruses in the virtual net world. 

In rockman, the characters uses data chips to upgrade and attack. In Senki Zesshou, the characters uses songs to get battle ready and attacks. 

both are about boys who were bad players at a popular arena battle game, but then gets a new awesome Gundam/Navi that helps them become one of the strongest players there is Differences: Gundam is about robot toys and the story has the main character's partner as his Gundam's pilot; Mega/Rockman is about virtual AI and the story has the main character's partner as the AI 

Kids use digital based hero's to fight bad guy's and their digital villains. Hero's and navies are stored in devices. PET/DISK. Both anime's use classic characters from other works. Battling evil organization that has the same power as kids. 

This series delves into human and computer inhabiting creatures coexisting together, there are also digital enhancements, internet battling, rivalry between key characters, and both have respective video games for each franchise. The difference is that Net Ghost PiPoPa is more educational and tugs at the heart strings a bit more than Rockman.EXE, had fewer story arcs, and was never dubbed.  

The battles mainly take place in the virtual world. In Rockman, the enemies you fight are viruses, and you gain things after deleting those viruses. Same concept with SOA, you fight monsters, and you gain things from stuff they drop. Another neat thing to point out, there are Charged techniques used in both series. Rockman's Charged Shot, and Kirito's Charged Slash.  

It is an odd recommendation but I can't help but see Blues EXE being similar to Gaelio due to the same VA and both are police who are rivals with the main character. Both are cartoony in some way but have serious moments as well and Rockman has a history of having elements being influenced by anime such as Gundam for example. 

In both of these series, the main character is a brown-haired guy who's a bit of a loser in some way at first. But then through different means, each gets a digital companion (who they both thought were weak at first) and do battles with others in a game-like setting. The main characters are very similar, they even have the same voice actor, and there are several other characters who share voices between the two shows. Both shows feature a digital world where people battle. Both are shounen. 

both are based around notable jrpg series and both have alot of flashy and stylish action and charming group of characters as well too. 

They have have Dolls in Fantasista Doll and PET in Rockman.EXE that is made from data. The PET/Dolls also fight with each other and uses CARDS in Fantasista Doll and CHIPS in Rockman.EXE to use a special attack. Uzume and her Dolls become really close friends like Netto and Rockman and both of them found real friends who helps them in difficult time. 

the story but the main character of RockmanEXE use net navi and the main character of Plawres Sanshirou use doll. 

The character designs for the Navi in Rockman.EXE and the hero in Sacred Seven have simularities in style, not to mention there are other things in the style that is reminicant to each other, though the truth of the matter is, Sacred Seven is darker then Rockman.EXE from the get go, and Rockman.EXE doesn't get dark until later seasons. 

Both anime are simular in that the net is it's own world and they have some sort of a navi or another. The different takes are interesting, and there are even fights a navi user can have with said navi. 

Has the same sort of story i guess. only difference is Rockman.EXE(Megaman Nt Warrior) has to do with the Net and Medabots is real life. In Rockman.EXE humans control beings on the net called net navis using their PETs (PErsonal Terminal) and they can carry out everyday tasks and have net battles. For Medabots they are controlled by humans in real life using Meda Watches to do everyday tasks and Robattles. 

They are similar because the battles are performed by robots, controlled by its owner. 

they both have a pet or angel.. they customize them.. and they both fighting in net.. 

Both have a futuristic "Twenty minutes into the future" style setting that is mainly focused around a interconnected cybernetic world that at first appears to be a video game; but is later shown to be something else that has far more dangerous consequences and potential for abuse in the real world. Both shows also focus on the protagonist's circle of friends as equally as it focuses on him. 

Same American feeling (stronger on Heroman, but still). They're about a boy with a technological partner who fights against computer viruses (on Rockman.EXE) or aliens (Heroman). Both are intended for young audience.