Back on subject... I used Botecote for my first build, and have just about completed my second using Wests. I like Wests for the lower viscosity in wetting out. It also cures quicker, even with the slow hardener. Bote Cote can take more than 24 hours to be sanding-ready, whereas I have found that the Wests can be sanded well within 24 hours (although I haven't used it in cold weather). With Bote Cote, the thicker viscosity is great for fillets, and I think remains workable for longer, so for those long gluing-up sessions Bote Cote might be preferable.

Perhaps a mix of both brands is the way to go, and use them for different aspects of the build.