How does/should SD <-> IDE compare to CF <-> PCMCIA as a Silent Book Drive?

I've never benchmarked the 512 MB & 1GB CF <-> PCMCIA troubleshooting combos that I've been using on and off for about 9 years now. The SD/IDE unit is slated to go into a 5300ce. I haven't gotten to the point of trying it yet.

Has anyone done this comparison? :?: