Having one type of knife is like having one gun..it's just boring..lol I have Stainless and Carbon knives, they both have there place. I find it easier to get that razor sharp finish with my carbon blades, but for the most part thats not really nessessary for day to day tasks.
I will say this, the blade that is on my side when I am hunting or hiking is a Carbon steel blade, for the ease of sharpening in the field. The particular knife has a sharpened spine and throws great sparks as well.
Around the house I have a Kershaw Stainless folder, and a Mora High-Q carbon knife; I use them all the time and I'm quite fond of both.
My filet knifes are Stainless of course, but all my axes (Granfors Bruks & Wetterlings) are Carbon steel.
The Gerber LMF II under my drivers seat is Stainless.
Every tool has it's place.