to be quite honest, i have never had any reliability problems with AMD or intel.
i have amd since their 386's clones up to my Athlon 64 venice, and i have had intel chips from their 8088/6's all the way up to the Pentium 4 northwood in my laptop. well, one problem. i had an original pentium 60mhz that had the FPU error, but they replaced it for free.