Whilst the Crud mk2 aren’t as durable as Race Blades, they do a better job. I previously had Race Blades, but the rear doesn’t cover the back of the seat tube and the front doesn’t cover more than the downtube. Also, even with some extra protection, the mounts on these got enough grit and movement to wear patches through the paint. Also a touch heavy if that bothers you.
I’ve got Cruds on my carbon Boardman for the 2nd winter now, and they do a good job. There’s good coverage, including under the brakes and down to BB, and the mounts are firm. Weak points are the screws joining parts (lost one section due to loosening), poor clearance for mud and the difficulty in getting good alignment so they’re not rubbing.
If getting another bike with proper mounts and clearances isn’t possible, I’d suggest going with the Cruds. Read the instructions and take time fitting.