S-Tier Deadeye
Essentially Bows and Crossbows dominate the game. As far as I understand they sit at the top of the build ladder in terms of all stats except defense. You can still build sufficient defense to level to 100 and do all bosses deathless therefore making the best builds in the game hands down for SC. Lightning arrow for Bows and Explosive shot/Grenades top the best builds you can play this league so far. With galvanic and shock burst coming in second on crossbows.
Recommended builds: Fubgun Lightning arrow
A-Tier Lich Bloodmage
Lich Crossbows is currently just slightly worse than deadeye crossbows in speed, single target and coverage. While being very good its just worse. Lich ED is slightly worse than Lich Crossbow, has the same coverage but much lower single target damage in exchange for defense which kind of doesn't matter in the current game.
Blood mage is essentially a super high DPS build, high def, high coverage with not enough movement speed compared to the higher tiered build. The price tag of this build can get quite huge as some of the base unique items cost a ton.
Tactician is a great all arounder. Has mortar builds crossbow builds and gets big buffs in party play and banners. A solid plan is very good atm because you can use multiple spirit reserve supports. Pin provides an excellent defensive option.
Amazon worse deadeye, maybe more damage in a patch where single target does not really matter.
B-Tier
Invoker - good all around build, not the best at anything except getting tons of ES. Shattering palm remains a great clearing skill.
Witch hunter - The new buffs to witch hunter lets you swap huge trees. Making some builds very dynamic in nature and can do multiple builds on 1 character.
Titan - is still the king of area of effect which gives you decent clear on stampede combined with herald of ice.
Ritualist - Shit ascendency compared to all the bow and crossbow ones but it starts in a good area is better than any of the choices under this.
Infernalist - While demon mommy provides tons of damage, it is still just legit worse than blood mage in every single way.
C-Tier
Pathfinder is essentially only good for poison and poison is not very good. You main node which allows you to run and shoot is essential worse than tree nodes because it has less and not reduced penalty. Poison has subpar clear compared to the rest of the bow skills. Decent recovery with 
Shavronne's Satchel but that's basically all it has.
Chronomancer is essentially is good for recoup and 
Temporal Chains and both are defensive mechanics that you do not need if you just destroy all the monsters. Essentially blood mage and lich are both so good it makes all the other casters look extremely weak.
Warbringer - Corrupting cry still has decent clear and shield wall for single target damage making it a decent setup for both clearing and single target. The number aren't great but playable and survivability is good.
D-Tier
Smith of Kitava - Nothing to really say here, Smith just isn't a great end game ascendency. He doesn't provide anything of value.
Stormweaver - Great in group play for double shock for your friend who actually does damage.
Gemling - play anything else.
F-Tier
Chonk - my mama said if i got nothing nice to say don't say anything at all.