Hi, I am about to start reloading .223 and will certainly have a few (probably dumb) questions. Here's the first:

I will initially be firing 55 grain bullets through a 16" barrel with a 1:8 twist rate. I am looking at powders which are currently available in the shoo I use, my choice basically comes down to spherical or tubular. Can someone tell me in very simple terms what difference this would make, and which is better, if any?