We've had the
Canon 12 x 36 IS since we started cruising in '08. We use them EVERY DAY. I like most that they're compact, no awkward battery pack with a wire that will break, they are a shape that's easy to use, not heavy, and about the right magnification to read boat names from a distance. The stabilizing is great, as others have noted, once you have it you'll always pick up the IS set.
My only complaint with the Canon is that the rubberized housing gets gooey and sticky. Have had them rebuilt once in the interim to the tune of 75% cost of new. Bad choice but it snowballed from the original estimate. Canon's service is very responsive, if expensive. The housing was replaced at rebuild, but it is again getting sticky and we've been careful to keep them in a case when not in use. So it's something that is going to happen in time. For that reason, I probably wouldn't repeat purchase, but I love using them if not for that one messy shortcoming.
Friends had the Nikon 14X with the external battery pack, they were terrible. OK optically, but like handling a brick on a string, and the power wire to the flopping battery pack was intermittent. I repaired it, but it's a lousy ergonomic design.