IMO
1. Winchester Model 12
2. Ithaca Model 37
3. Remington 870
The Mossturd need not apply IMO.
I like those 3 but in this order:
1. Ithaca Model 37 (old style)
2. Winchester Model 12 (it's a classic)
3. Remington 870 (What can you say about this one it just works)