Unless the rose is to be a highlight in your garden spot or it gets really huge, I think having several bushes together will give it a better appearance, since you mention concern about appearance.

Personally I like a rose bush that blooms constantly throughout the growing season. In fact, I'm not sure I can say that I've seen a "regular rose bush" that doesn't bloom constantly in my areas, but of course, I can't say I would know the difference, as sometimes I just see roses that may start blooming at different times or that were pruned to encourage even more blooms again later in the season.

But at the same time, you could plant a few types so that the total imagery created by your rose bushes is that of a constant bloom in your yard, even if in reality, one or two of them were not in bloom.