I can't comment on Full Tilts,
but I ride SPK Kaos. The kreation, as I understand it, is a lighter more jibby version. Also cheaper. The SPK range have a very wide toe box, which is great for hard landings. They are canted quite far back to suit switch skiing, and they are very good for skiing switch. Some people have commented that this impairs their back country use. However I have had no problems. The SPK has an internal lace which is really good and the big velcro strap holds the front of the boot down nicely to prevent shin bang. Off the top of my head I don't know the flex for kreation, from what I remember the Kaos is 95 and I have a feeling the kreation is the same. Possibly less though as it is more of a park boot.
However, as I said it is still really important you try before you buy. everyones feet are different, just because one person raves about SPKs or Full Tilts does not mean they are going to suit you too. Also remember that you hardly see your ski boot when you are wearing them on the slopes because they will be covered by your pants and binders. So don't buy based on looks either.
I have given the best advice I can. If you still go and buy boots without trying them on then it's your funeral!