I never did comparisons between these two drives, because I always use my Premium when I need to rip a CD. Sorry, I'm not able to answer this question
About the ripping process, I always thought that the machine (i.e. CPU, mainboard, etc) has no influence on ripping speed, because all the work is done by the drive, so whatever is the machine used, the drive still will work the same at the same speed. The only exception is if the mainboard is so old that it can't run at full speed or if you connect the drive through an USB1 port, but these are rather rare events in these days.
Maybe the only difference that can have the machine power is about FLAC compression itself, but this is not related in any way to EAC because if I'm not wrong it has not the FLAC compressor embedded, but it uses an external one.
When I have to make a FLAC file, I usually use EAC to rip the whole disc as WAV, and then I use the FLAC frontend to copmpress the file after all the ripping work was completed.
BTW, is it certainly possible that dbpoweramp is more updated and optimized than EAC so it can rip the CD more efficiently. Again, I'm not able to answer to this, sorry