All other things equal:
I'm an ex smoker and slowly lowering my nic level. To keep a good throat hit do I use a higher or lower ohm coil?
I'm a MTL vape
To answer your specific question, vaping MTL you can get a good throat hit with, for example, a 1.5Ω or a 0.5Ω coil. I vape MTL, RDL and DL. I make my own coils. My MTL coils are between 0.45Ω and 0.7Ω. I haven't used a coil above 0.7Ω in many years.
If you roll your own coils try raising your coil for a stronger throat hit. Lowering your coil will give you a "lighter" TH. You will notice a difference in TH by raising/lowering your coil.
Higher PG juice will give you a stronger TH. 50/50 or 40vg/60pg will give you a good strong TH. I DIY my juice (50/50, 60vg/40pg, 70vg/30pg).
As
@charlie1465 said, your choice of atty does matter. Some are well known for a stronger TH versus others. You might have to experiment with several atty's to see what works best for you.
Good luck to you!