1 x 11 gearing for primarily road riding
jono, thanks for your reply! I have a Giant TCX and I put Zipp 30 Course's on it (got em for about $800 from my local shop). In the winter I just put the original Maxxis Rambler 40m on the Zipps - which work great on everything but ice. I understand the ratios you listed so yes, the 10-42 makes more sense for me (spinning out early on descents is the issue).
Loving this bike especially on longer road rides!
What are you on?