Had a b16a in my civic..... Going straight b20 motor....

I know you can use both crank pulleys, but is there any advantage to using one over the other? I don't have AC or Power Steering, or ANY POWER sh_t for that matter... hehehe I do have a small amp (200watts RMS) powering my front speakers and my sub... Other than that, I have nothing that really draws a lot of power...

My friend said to swap the b16a crank pulley over because it's lighter. I also know it will also spin the alternator slower because it's smaller. That means less stress on the alternator right? Or no extra stress on alternator?

However....... I can't take that damn 19mm bolt off. Hell, I can't do it on my b20, I doubt I can do it on my B16a.... If possible, I would like to just use the b20 crank pulley......

Any major disadvantages other than being a little heavier?? Or should I REALLY change it to the b16a pulley from my b16a??