For 100 plus milers, I pull out the higher end shorts for sure. I have a whole trunk load of cheaper or older shorts I use for spin and mid-week rides, but for the weekends I dig around to find the good ones!! Crazy that your shorts failed on you.

I do like the higher end PI shorts - with the 3D (?) or something chamois that is green and tan. Those have been my most reliable double and double metric shorts.

I also like Castellis, and wore those for a double last year. I like the PIs better though.

But really the best are the Assos. They are great on long rides - but they are a bit shorter than the others so it needs to be warm. That chamois is terrific.

And I have to mention again those witches britches (from apparel thread). Not good if you need them NOW, like you clearly do, but those are great for long rides.

Good luck!