TM Grass Starters

The dps difference between Fury Cutter and Bullet Seed is negligible on most raid bosses that are weak to grass. The only time it's a relatively big difference in favour of Bullet Seed is Lapras and Regirock (there are better counters anyway) and it's in favour of Fury Cutter with Tyranitar (but who uses anything but fighting types here anyway).

Therefore, I'd say it's up to preference: Do you like fast hits and more dodgability or do you like slow hits with more damage per hit and less dodgability.

I hated Bullet Seed on Exeggcutor. Sceptile makes better use of it but I still prefer FC on him, or any other mon that can use it for that matter.

Last time I was comparing against various raid bosses on PokeBattler, I don't remember the exact details but I had this takeaway:

Fury Cutter/Leaf Blade has better neutral damage even with clear skies boosting grass moves.
Bullet Seed/Leaf Blade needs both weather and a type advantage to pull just slightly ahead, but not nearly enough a difference to be worth the cost to dodging.
Only with both weather and exploiting a double weakness to grass does the lackluster Bullet Seed gain a significant difference over Fury Cutter.