Or you could just get Octavia who is good at basically everything ^.^
As someone who maxed out damn near everything:
Loki Prime: Solid all around, but obviously best for Spy (also good for sorties).
Ember Prime: Running through anything lower than 40, including low level defense.
Equinox: Best frame for grinding out MR (use defensive stance for shield overload/heal), also good for stuff that Ember Prime is too low for.
Trinity Prime: Similar to Equinox, but only if you have EV. If you do though, basically good for everything since you're damn near invincible.
Frost Prime: Higher level defense.
Limbo: Grinding Excavation, and sortie defense missions (if you want to cheese them). Also was good for sortie defense if you can still banish (not sure if that's been patched).
Nekros Prime: Grinding basically any material.
Volt Prime: My go to frame for basically anything else, and probably the best all around if you can't figure out what else to use. Just speed through shit.
Rhino Prime: Only frame worthwhile for Index (I've been told Ash is good, but nah).
Octavia: Similar to Volt that you can use for anything, but I prefer Volt. That said, Octavia is almost my default for most sorties besides Spy, just because you can invis and destroy everything with very little effort.
Hydroid Prime: Only mentioning because of Pilfroid. Otherwise not exciting.
Every other frame wasn't really worth using in my opinion. Although I never really got into Eidolons. I will say Harrow was fun as shit leveling up and is insanely powerful, but fuck what a pain in the ass to manage his abilities. That all said, every frame is "usable."
For Archwing, only worthwhile is Amesha with Centaur and Fluctus. Literally all the other weapons are shit compared to those.