Boushoku no Berserk

Pretty much the same show. Typical everyman main character actually possesses god-like powers that manifest themselves whenever the plot requires, effectively removing any stakes or conflict from the story. Generic one-note characters including a girl, who likes the MC for some reason. If you liked one, the other is more of the same, so you'll like that too.  

in the anime Boushoku no Berserk, just like in Tensei shitara Ken deshita, the partner is a sword, however, unlike the anime Tensei shitara Ken deshita in this anime, the weapon itself has several forms for support and attack, as well as in both anime, the guns themselves talk and become stronger in both anime there are characteristics for leveling and raising the level, also, the main character himself also becomes stronger, makes friendly acquaintances and tries to protect everyone, as well as hide his real strength so that others cannot find out. 

Both shows are dark power fantasies, with the MC starting as the underdog. 

Similarities Both MC have a level system only they can see/access Both MC absorb powers of the ones they defeat Both MC become OP in the beginning Both MC are treated as trash in the beginning Differences SL is more of a game style vs BoG is more of a Roleplaying style SL takes place in a modern world vs BoG takes place in a midieval world 

If you like the series "Boushoku no Berserk", you might also like "Tate no Yuusha no Nariagari". In these two action-packed fantasy anime, the male protagonist faces strong rejection from the people around him. Instead of giving up, they embark on an adventurous journey and grow in strength. "Tate no Yuusha also has an isekai element. Visually, the series are on a similar level, the character design is nice to look at, as is the animation as a whole. The soundtracks of each series are well done and have many nice arrangements that fit the mood. Thank you for reading and have fun watching. 

If you like the mechanic of the MC defeating monsters to steal their skills then this could be for you. The plot is not very similar.