avice needed on rockwool cubes

:) ello all.. i was just getting a little order of surplies ready .. i was going to order some gordons rockwool cubes for starting my seedlings on my next grow.. i noticed that there is another kind of cube called flemix organic starter cubes... are they better then rockwool???
quote from growells......



The perfect product for the dedicated soil or coco grower, Fleximix Organic Starter Cubes are the organic grower's alternative to Grodan Cuttings Seed Cubes. Completely bio-degradeable, Fleximix is a mixture of coco coir, peat and bark that gives you excellent aeration and drainage.

Coming in trays of 24, Fleximix Organic Starter Cubes are one of the best rooting mediums we have come across - rooting successfully up to two days earlier than rockwool during tests. Ideal for transplanting into Bio-Bizz All-Mix, Canna Professional Soil, Canna Coco, or your own organic mixes.....
so what 1 should i go for?? any1 had experiances using both normal rockwool cubes and the flemix organic starter cubes???

ps.. sorry if i sound stupid for even asking the question .. im guessing that the flexmix organic starter cubes are probly better for the seedlings then the rockwool cubes.. but i dont know as i have never used either product.. any help would be much apreciated ;)