User blog comment:LuigiMaster41/Favourite Mario Bro./@comment-31116152-20200116025608/@comment-32125535-20200116211931

I like both of the Bros., but I chose Luigi because Luigi has more personality than Mario, and he is more expressive with his personality. He has also saved Mario countless times, and not just in the Luigi's Mansion series.

Statwise, Luigi controls better than Mario. While being balanced is good, Luigi just has better statistics such as a high jump power and speed, but is kinda slippery (per what you said Derek). And let's not forget his OP backflip in SM64DS and the ability to run on water.