As a sizing guide, Bontrager suit wider feet, Shimano narrower.
All road shoes are designed to be used with road pedal cleat systems. The more expensive options will be lighter in construction, have better ventilation to keep your feet cooler in the summer, and will have a stiffer sole, for better pedalling efficiency. Don’t forget to cover up with overshoes in cooler weather too.
Unconditional Bontrager Guarantee - all Bontrager shoes come with a 30-day trial period, if you don’t like them, return them for a no-quibble refund.