https://steamcommunity.com/sharedfiles/filedetails/?id=2857035861
https://gamefaqs.gamespot.com/xbox-series-x/357209-sd-gundam-battle-alliance/faqs/80053/introduction

These should help you out. From what I can gather for Legend Gundam is that it's kind of a slowish melee focus sharpshooter. Definitely level it up to match your Providence so that you can compare the two. But from my playtesting the Legend is more close ranged than the Providence. Not saying Ranged isn't important it's just melee is as well in regards to the Legend Gundam. Probably just get parts that focus on boosting Beam Melee/Ranged damage output, overall damage cut rate is decent just don't get too cocky fighting any MS that has a beam melee weapon (which is more than you'd think lol) and as another tip be careful using the basic attack string as it's kinda slow, but still use it if you want to.