Ditto on Dade's (shown mid-front row in pic). I cannot speak for every brand, don't drop them...rounds will be rolling around everywhere.For N-Frame speedloaders, my choice is the Dade Screw Machine Products speedloaders.
Rounds are retained by a circumferential spring and a simple push of the knob chambers them.
http://smith-wessonforum.com/lounge/309051-dade-screw-machine-products-speedloaders.html