The motor would be what made my decision between those two boats, personally I hate Mercurys. I just rebuilt a 12' and have had my Mercury 9.9 on it. At 121 pounds, it was way heavier than most "portable" engines but the boat handled it well. I am getting a lighter Honda (and short shaft) next week and look forward to getting it out.
They are VERY stable boats but steer quite differently than a V-hull, so be careful to begin with if you have used a V-hull much. As far as trailering, as mentioned, just take those corners wider. A short trailer is much harder to back up than a longer one.