Well, alox scales make for a slimmer profile, and the weight difference is negligible. I personally love the feel of the alox knives, particularly the soldier (farmer, minus the saw and key ring). Alox just feels more solid, and the knife blade is a little thicker. Both will do the job just fine, but who's to say that the cellidor scales won't crack after dropping your knife one too many times.
That being said, I like my OHT over my Farmer. I take it hiking all the time, though I haven't really had a reason to use it (except for the toothpick, to get a piece of pear out of my teeth). I bought a red alox version a few months back off of recommendations on these forums. The knife is solid, and I can see how it's developed an almost cult-like following, but it never caught on with me.