When i started playing BB i first trained a SG because i really am a big fan of shooters.After 2 season even if i managed to promote to the 2nd div i was at a disadvantage because in the early years in my country most of the teams were playing inside and i only had 1 solid player and an average substitute(because i was not really good at training back then
).
Now after a couple of seasons in training all positions have to say that the order for the most important players in my opinion are SF - most valuable now, PF - balanced players will give a big advantage, SG - for the points and for those last quarters, C - i only use them for rebounding and some occasional points and blocks, PG - this is because i never had the time, not yet, to make a complete PG(with inside skills too).
This will surely change in the next couple of season seeing that almost every team that has a solid team by now is starting to train SF and PF their value will gradually go down.
But still may favorite will be a Kobe like SG
.