 If you liked
Full Metal Panic!
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 ...then you might like
Bakuretsu Tenshi
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both are mecha anime but while Bacuretsu is more serious FMP has more comedy involved.
Lots of comedy? Cool mecha action sequences? Mercenaries and secret organizations dealing with conspiracies and various underworld affairs? You will definitely find these aspect in both FMP and Burst Angel! If you liked one of them then you will enjoy the other one as well.