There isn't as much published information about the profiles on the Matrix (or any ultima) blades.. paramount has always been very open with their various blade profiles... ultima is a little bit of a mystery and while I've heard certain things, none of it can be verified by any public source. Matrix blades also use a slightly different kind of stainless steel than the paramounts do, and it falls somewhere inbetween 420C and 440C.
I also like that I can get a
licensed copy of the MK profile I prefer (Phantom) rather than just a "clone" - the picks may look similar on some of them (Freestyle is the "clone" for Phantoms) but I have no idea about the rest of the blade with Ultima... with Paramount I know it's the same profile I've been skating on for the past 18 years.
There's also the issue of colors
My current blades are very very vibrant turquoise (my old blades were
very very green) and you can order any color (or combination of colors!) you'd like from Paramount for a small fee... ultima only comes in their stock colors. Not a big deal for most, but if you like color.... paramount is the only way to go, plus they are made in the USA
The price difference is about $100 between paramount and ultima, but if you compare the paramounts to MK or Wilson blades, some are less, some are even slightly more.. there's only a $25 difference between the phantom specials I used to skate on and my current paramounts.. but if you take away the fee for the custom color my paramounts were cheaper (at $450 when I got them over the summer, I think they're a little more now, but it's constantly changing as the price of materials changes).