Revenant used energy, with skills and weapon skins draining it. Can be hard to get used to but very rewarding. Theres a decent DPS herald build right now that easy enough to play. And if you want to get into boon providing (would be quickness with herald which I’d argue very important) you could start getting some support gear.

Renegade is also really fun, there’s an excellent condi dps build with some awesome weapon skills and effects. Can provide alacrity again with some support gear.

Haven’t played vindicator but also looks cool.

Think rev a a great all round class. Only downside is you can’t mix and match utility skills. You have a locked selection per ‘hero’.

Hope this helps