I purchased my valiantco golok before brkt started making goloks - the brkt golok is obviously inspired by the valiantco golok and a tribute to how good a woods-tool they are. I believe Mike Stewart goes to great lengths to offer what outdoors-people really want and need and the brkt golok is a prime example.
but if i had to make a choice between the two, i'd still choose the valiantco golok. that said, my opinion is based on never having handled a brkt golok so naturally i'm biased toward what i have experience with.
here's the reason why i'd choose the valiantco - comfort. the valiantco does not have a full tang whereas the the brkt does. the american knife market tends to see this as a drawback - and i'm sure the brkt golok is ultimately stronger and less likely to fail under extreme use. but a full tang tends to transmit the vibration of impact into your hand when chopping. the valiantco golok handle better absorbs the impact vibrations and doesn't transmit them - additionally the handle on most models are curved with a bulbous end to the handle which increases the comfort level. the best way i can describe it is the force of impact is spread out into the palm of the hand by the curved bulbous handle.
these considerations of comfort don't really matter if you're just doing some light chopping - it only comes into play for extended chopping sessions. and again, this isn't based on experience i've had comparing the two. it's just based on my own experience with how comfortable the valiantco golok is and the basic understanding that if you're holding the end of a thick piece of metal and whacking it into a log, it tends to wear you out after a while.
people have had cracks form in the handle where the blade is inserted. on my own golok, the bone ferrule has cracked. again, is this a drawback? depends on your perspective - i see it as a strength. the tang is transmitting the impact into the handle instead of my hand. i haven't heard of a failure (loose blade) due to slight cracking of the handle. if cosmetic cracks bother you, you may be better off with a wood handle as it seems to be the buffalo horn that generates cracks.
another final consideration is aesthetics - the valiantco goloks are not perfect. you can still make out the hand-forged nature of the blade - there will probably be a slight waviness to the blade's surface and the remains of hammer marks. suwandi has stated that to grind the blade to the point where those imperfections are removed would substantially increase the cost.
oldjimbo.com is a great place for more info on the valiantco blades.