Fighter

Rogue if looking to get maps which is really the number one reason to solo.

Barb because retribution is OP as fck and the other barb skill(knockdown?) is good.

Guardian-

You'll get more prof on this character than any other because of how slow he kills.

Incorrect, show proof?

I know for a fact that using heavy weapons I gain less prof points compared to any other character using a single handed weapon.

Rex is right. You're so wrong here Dan. I know for a fact that on guardian and using any weapons at all but not clicking I gain less prof points compared to any other character who actually clicks mobs!

Also, the best solo hero so far was a rogue

But that could change in the near future

I did soloing wirh barb and fighter and prefer fighter ofc. His skills are better in my opinion.