I think the general consensus would say Conga and Tumba.
Those drums are the fundamento of rumba and casino styles alike.
Heck, you can play a guaguanco on the conga and tumba without the quinto and it will be recognized as a guaguanco.
Quinto is a great sound but more conducive to rumba.
If you get a gig playing with a conjunto, you would have to play it tuned down to be in tuned with the other instruments.
The larger space on the conga also gives you space for your right hand (for those unfortunate people who are right handed
)
You keep masacote smoother if there is more space.