I'll be doing the weekly commuter shortly (ATL to PHX) and just getting started on my Delta Journey (picked up the Business Reserve Card with tons of bonuses just before COVID) and would like to maximize hotel and car in conjunction with Delta. So I'll be trying to rack up as much as possible toward Diamond status. So, its an opportunity to rack up as much as possible toward Hotel and Car as well.

What is your preferred partner Hotel and Car Rental Service?