It's failing or simply loosened up?
KYB's are highly decent and should last a while. Monroes should be avoided. Best bet would be OEM.
Well, the piston of the shock absorber jumps when turning the steering wheel. Also the mount is noisy when driving over small bumps. It crossed my mind to tighten the bolts. Can it be something that simple? I hope so.
Anyway, I was not impressed with their quality. The bearing didn't fit tightly in the mount and the mechanic used the old bearings to avoid creating a noisy set up. I also have to mention that by Googling I have found many negative posts about KYB strut mounts in different forums.