All are viable, but some categories for you
Survivability
Trapsin
Ele Druid or summoner
All have benefits that makes it easier for them but trapsin has so many tools like fad and mind blast she’s just safer than any class imo.
Early game
Trapsin or ele Druid
Summoner
Early on you have to buy potions as a trapsin and elemental druid but they are faster than a summoner by quite a bit
Mid game farming
Summoner
Trap or ele
Only reason I am giving it to the summoner is he can literally go anywhere. It’s not fast but the fact that he can is a win in my book.
Trap and ele have places they are good in but none of them are great boss killers. A low res wand will be needed for trap.
End game farming
Trap
Ele
Summoner
There’s a lot of benefits to each but trapsin should be the fastest with a Druid being close behind. The summoner has more prep he needs to do but is okay in p8 once he gets rolling
ty mate. Appreciate this qualified answer.