Comfort also goes with type. When I was in the military, standard issue was 10" speed lace. Now that I'm in the oil patch, the only 10" boot is a logger style with a puncture-resistant plate in the sole - pretty hard on the feets.
The next best thing as far as a lace-up (IMO) is the 2408. Put in a pair of Dr. Scholl's and you'll be gellin'. I've had my pair of 2408 for five years and I'm very satisfied with them.
If you want to slog in the mud/muck and not worry too much about wet feet, try the 4434 although I hear they get a bit warm...

Red Wing's 8-Inch Lace Up 2408

Red Wing's 8-Inch Lace Up 4434
I haven't had a pair of slip-on (Wellington), but those are next on the list to try out.