Please....give me a break!

Crystal is a tad larger than the RSSC Mariner and the Voyager (approx 900+ Crystal vs. 700+ Mariner)

There is never a wait for anything on either cruise line. The only time we ever waited on both lines is for a tender to shore at prime time. The Crystal alternative restaurants are quite good and Prego is really terrific. In fact, you can make a reservation for either Prego or the Asian alternative via email a month before embarcation. (This avoids the "rush" on RSSC to sign up for Signatures upon arrival on board)

There are differences between both cruise lines but waiting in line is certainly not one of them.
Both cruise lines are extraordinary and would not be considered "mass market" ships even by a stretch of the imagination ( If Crystal is considered a "mass market" ship then, a fortiori, so is the Mariner and the Voyager.

All things being equal, I would choose Radisson, for a number of reasons but certainly not "waiting in line" or the "mass market" label.

Finally, if you are a social person, you can meet and greet fellow pax on either ship. It is the closeness and camaraderie of the LCT group and the CC Rad board that "assist" a cruiser in having a great time and meeting new people.

Enjoy both cruise lines for you will have a great time on either line.