I now have both, having the gb sfa for a while and directly comparing the two over a few days.
I have modded my cold steel trail hawk so it will perform differently to a new one.
My mod's are:
shortened the handle by a few inches (it's now the same length as the gb sfa)
removed some steel under the head so it is more beared in shape
thinned out and convexed the edge
removed the paint and forging marks to 180 grit so it is smooth
treated the handle
The gb sfa does carve, split and chop better than the cold steel trail hawk but it weighs alot more and is bulkier. Takeing the cs trail hawk instead of the gb sfa is only really a comprimise when splitting wood as it does chop and carve wood quite well. when splitting with the trial hawk you will notice the small face of the axe gets stuck in the log and doesn't have enough weight to help it get through everytime compared to the gb sfa.
The light weight head of the trail hawk makes chopping high up branches pretty easy and if you give the hawk a decent regrind you will see it work well above its weight! the way mine is ground also makes it stick in wood less than my gb sfa, and this isn't because I have an obtuse edge (it is infact pretty acute and razor like!) but it's the rounded belly of the blade itself that helps it cut in and break chips out.
The hammer poll on the trail hawk is pretty usable, not as large or as hard hitting as the gb sfa back end and a little more precison is required to make it effective but it's still good.
The steel is pretty good on the trail hawk, nice bit of carbon steel with differential heat treating on the blade and hammer end, edge retention is alright and is also easy to keep hair splitting sharp! The gb sfa I would say uses better steel and holds a better edge but it does cost over twice as much so that's expected!
The handles of the two are completely different, one is long and straight (trail hawk) the other is shaped with alot of thought gone into it (gb sfa). I like the straight handle of the trail hawk, it means making my own ones will be easy and storing it in a pack is simple as it's straight and won't waste space. The gb sfa is fixed but is beautifully made and treated. It makes the axe balanced nicely in the hand and the lower half of the handle sits well in the hand giving you a good grip for powerful swings.
The cold steel trail hawk, in my opinion comes 'unfinished'. This means all the finer details of fit and finish are left out as it's mass produced, leaving all that stuff to you! that's the fun part and the reason why I bought one. With a file, a few sheets of sand paper, a saw and some linseed oil you can have a lovely bargain axe to work on and to stuff away unnoticed in your pack.
The gb sfa is a 'finished' axe, alot of skill has gone in to finishing it and many years of expertese have gone into designing it to be so good at all the jobs you'll be doing around these parts. GB is the best line of production axes out there, the sfa is a perfect all rounder and it is a joy to use.
a photo comparison:
The extra weight and size of the gb sfa head gives it the edge at cutting and chopping but the light weight trail hawk is fast and energy effecient in use, the two differences almost equal each other out!
I like both, and for different reasons and roles. My advice is save up if you can and get both, or do your best to borrow both and give them try for yourself.