I tried all the WSM’s at one point or another. Looking back, I clearly got sucked into all the hype in the early 2000’s!
I always thought the 7WSM might be the best of the bunch…with good velocity and med/heavy for caliber bullets. I had a sweet little Sako to shoot it. However, good brass for reloading was impossible to find. That and ammo availability were the biggest handicap with the 7WSM, IMHO. Winchester used to make decent brass but by the time the WSM’s were rolled out, the Win brass sucked. I once bought a box of factory Winchester 7WSM factory ammo and every singly neck split on the first firing! So much for saving the brass to reload!. I sold the gun and reloading stuff not long after that.
The only rifle I have left in a WSM cartridge is a light, accurate 300WSM. In the last 3 or 4 years, ADG started making brass for that cartridge. What a difference good brass makes in my reloads!
Many “folks in the know” say to only purchase a cartridge that has good quality brass availability, and stock up. They’re not wrong.