Since there's so much Sniper talk, I'll go into a little more detail. I'll list Snipers in descending order by base aim assist with a little commentary for each:
Prudence II: 74 AA. 13 impact: extremely low (below LGH, no revive kill), no longer obtainable in-game. If you have an old one with good perks it might be worth testing. It's got higher impact than a Subtle Nudge (10) but lower than LGH, don't have one to test. Still, you'd have to rely on having gotten one, not dismantled it and it having dropped with good perks randomly.
Shadow of Veils (PoE): 69 AA. High impact (31), enough for revive spawn kill. Comes with Shortgaze and Perfect Balance, but can't be re rolled. Instead of Hidden Hand and Unflinching you're stuck with a fixed Replenish (recover ammo on Super activation) and a random Fallen perk like Shank Burn. Still a fantastic option with insane AA, good sights, high stability and great impact. Definitely top-tier despite not being re rollable.
The Supremacy: 63 AA. High impact (31), enough for revive spawn kill. It's the old Queen's sniper so no longer obtainable in game. Not re rollable, but if you have an old one with good perks it's a beast. Unflinching + Perfect Balance + Final Round for instance would be sex.
Eye of Sol: 61 AA. Low impact (13), not enough to get that revive shield kill in one headshot. Not re rollable (ToO drop) but has great perks - Army of One (Hidden Hand with this much AA would've been a waste tbh as there's probably a cap it would've hit anyways, though it's just my speculation), Unflinching...I yearn for it tragically.
Her Benevolence: 55 AA. High impact (31) so revive kill possible. Currently obtainable and also re rollable. The sweet spot. Love the Queen for giving you this, seriously.
Longbow Synthesis: 53 AA, 31 impact (revive kill possible). No longer obtainable, not re rollable. Keeper if you got good perks on it already though.
Low Grade Humility: 50 AA, 22 impact. No revive kill. Re rollable and obtainable as a random Crucible drop. It can kill in 2 to the body and fires quick, excellent choice for 6v6 where revive shields aren't present.
LDR 5001: 49 AA, 31 impact. Basically same deal as Longbow: not obtainable or re rollable but do ascend if you have good perks (that Final Round love...)
Subtle Nudge: 49 AA, 10 impact. Yes, 10. Won't kill in two shots to the body. This does Hand Cannon damage, just skip it.
AA takes a steep dive after that so I won't detail the rest.