Thomas was on the DC Circuit Court for 19 months before his nomination. He was a graduate of Yale Law school and had held several different positions within the Reagan administration including head of EEOC. He had also written and spoken publically on constitutional issues. To claim Miers has more experience is ludicrous.
I am fully aware of Thomas' background and have been a firm supporter of him from day one. But he has no significant experience superior to Miers' and not as varied either. Hers has just been more in the private sector rather than government. Most conservatives around FR then to deprecate government work hence CT should not measure as highly.
If I recall the Hearings accurately his judicial experience was not a point of interest for his attackers or defenders.