In general, they suck - which is to say, they hold a lot of water and promote root rot. What it really comes down to is what you are planning to do with them after they root - if your putting them in soil and water once a week, you should be fine; if you want to use them in ebb and flow or DWC or something, then use Rapid Rooters.
Personally, I'd just use Rapid Rooters -- they are really hard to fuck up (you pretty much have to just forget to water them) You don't have to wait for them to expand either - always nice.