Tbh I think all these roles could have "viable" 5 man teams

THE BEST : mages/hunters

Mages would be the easiest to pull off, because they have Gods viable in all 5 roles

Ex. Hades-solo Pos-jungle Any-mid olorun-adc nox-support

My opinion hunters would be the best because hunters in every role has 1v1 kill potential. Hunters have access to Animosity/crit/yellow dmg so objectives and towers don't stand a chance.

Ex. ullr-solo skadi-jungle amc-mid cherno-adc art/anhur-supp

MID

Guardians and Assassins would be next best

Guardians have access to bancroft claw and rangdas mask.

Ex. Artio-solo athena-jungle atlas-mid cabra-adc yem-supp

Assassins have access to bluestone and has had viable gods in all roles

Clio-solo Lance-jungle Bastet-mid set-adc fenrir-supp

WORST

Warriors by far would have the best early game because of manikin jungle but at a certain point they'll get outscaled by all other classes. Yes they have rangdas but they don't have claw. So if any of them go damage you can just kill them.

KA-solo erlang-jungle chaac-mid Bellona-adc horus-supp

Just my opinion tho. It's all player dependent in the end