Knights of Sidonia, just because it was one of the first suggestions for anime on Netflix. Cool atmosphere and good action scenes. Story seems stupid but it's good entertainment while working out. That's right i'm getting RIPPED while watching anime
That is the best mecha anime I've seen so far but I haven't seen much (never watched Gundam or Macross). Action is great but framerate issues are common, animation isn't smooth. There are many similar anime story wise but the most famous and popular is crap compared to Sidonia no Kishi. I'm talking about Neon Genesis Evangelion, do not watch that crap. It's overrated and made by some depressive dude, whole show is about depression and apathy. You'll barely notice robot fights because of the overall tone of anime. Everybody is that anime is a piece of shit.
I'd go with Tokyo Ghoul next, it's right up your alley. Cringy, made for goth teens and those who feel alike, edgy, gets the pump going, first season is actually decent. Tokyo Ghoul, Knights of Sidonia, NGE, Attack on Titan and many others are your typical anime where main character is some weak shit who gets stronger as the show progresses. He's the chosen one like Neo and rest of that world saving crap. Different themes same story, the most popular storyline in world of manga and anime.
There are better anime tho, but its not bad to start with the bottom quality wise and progress further to actual anime pantheon. If you do it in reverse you'll give up on watching anime fast because you'll go from good to shit.