as of lately, i am under the impression that no crank is superior to another. i feel as if you get one that is trued and welded, youre set.. if even only for a while.
sure, you can do the tz bearing, but as far as actual crank reliability, there is none. they will all eventually fail.
i have a buddy that ran his hotrods 4mm crank for 3 years. never had an issue. during his last rebuild he opted for a brand new crank. upon tearing the motor down due to a tranny issue, he finds out that the welds are already cracked.. we are talking basically 20-30 mins of actual run time.
my 10mm crank failed twice in 4 years causing me to have the cylinders nikasiled both times and new domes and pistons. my bike does not get a ton of run time due to it being a race only bike.
so anyway, i say it doesnt matter and until someone can somehow prove to me that one is superior to another, i will say go with whoever is cheapest.