I've always used my scuba fins. They're long but don't seem to get in the way, and are more powerful than force fins. The force are very comfortable, but I just don't care for that bicycle-style kicking motion (someone described it as moonwalking - good analogy). You can kick that way with the scuba fins if you need a break, but to cover water or to get to shore in a hurry to take a leak, there's nothing like the scuba-style fins.
I've tried the fake force fins, they're the right shape but heavy and stiff, no comparison. Don't bother. The small ones that clamp onto boots are no use if you want to cover any water.
The downside of my scuba-stle fins- in my pontoon (scadden Rampage), it's tough to get them under the brace-bar, but it's still worth it. They power my 10' pontoon along nicely, when I need my hands or don't want to row.
For the force fins users- do you wear them over your wader booties directly, or with wading boots, or neoprene socks, or shoes? My feet are size 14/15 so I have always had trouble finding fins to fit.
Thanks,
D$