So I've made a Tabaxi Rogue. Level 2.
Here's my stats:
It's a two person party. Myself and a Greatsword using Fighter. I don't anticipate the campaign going past level 10.
I'm curious about what Archetype you think would be good. Obviously, Arcane Trickster is out with my low Int. All Unearthed Arcana is available, so...
Mastermind seems alright overall.
Swashbuckler is solid all around, helping me dual wield.
Assassin doesn't add much besides nova damage, which IS great. But that's it.
Thief is... Alright. Lets me get creative with environment and item use.
Inquisitor (UA: Gothic Heroes) is... I don't know what to make of it.
I'm leaning Assassin. I figure the sooner enemies drop, the better. But after that single hit, it's... Not great. Swashbuckler, on the other hand, is more consistent damage over the battle.
If your fighter buddy is going GWM then go Mastermind. No need for extra dps from you when he's one shotting everything.