A solid roller may, or may not be any harder on parts than a hydraulic. It can be true, but the devil is in the details. With either solid or hydraulic, the lobe profile, and needed valve spring for valve train control with the chosen lobe profile will dictate the abuse the valve train will get. Furthermore, the same limiting factors that apply to a hydraulic flat tappet cam apply to a hydraulic roller cam. The hydraulic plunger can only take so much lift rate, and valve spring pressure.

You can get a solid roller that is nearly as easy on parts as a hydraulic roller and will last a lifetime, and with that you can be assured that you are not giving up performance due to the hydraulic lifter.

If you want an easy, no fuss cam that is quit, and performs better than a hydraulic flat tappet without the concern for eating a lobe, and can afford it, get the hyd. roller. If getting more performance and don't mind the noise and possibly more under hood time, get the solid roller.