I also own one of each design...and to be honest...the power supply seems to have marginal effect in my system...more relative is the features...or lack of them...pertaining to the preamps...
Preamp design approach - Power Supply location
Looking to hear from some design types or those who know something on this area. I have had both type of preamps and cannot myself say which is better but am very curious as to the perceived advantages of using external vs. internal power supplies (or vice versa).