Well either trailer I’m sure will more than do the job, the questions you need to answer is the single versus the tandem, IMHO I’d stay single, it’s much easier to manuver the trailer around, and less maintence. When I first got my boats I was thinking I wish I got the tand. trailer but my parking space is somewhat tight,normally I back it in by hand the last couple feet, thats much harder by hand with the tand. Also most of my trailering is local with a couple trips a year more than an hour’s drive.
Then it’s an issue bunks and rollers, I like rollers for shallower ramps, I have been very close to not being able to float my boat off the trailer a couple times, but I do have to say my boat goes on the trailer darn near perfect everytime with bunks, rollers can take some talent to figure out how deep to back the trailer in to get the boat on straight. With the rollers you can always winch the boat all the way up, with the bunks there isn’t a chance with my boat to winch it up, you gotta drive it all the way on.
Again I would say one trailer is really better, but I’ll bet one suits your needs better.