You could pick up a Bridge Rectifier for a few bucks, and turn the higher amp 15b AC to DC too. That might allow you a new perspective on ac vs dc . I'm a firm believer in forming your own opinion. Screw what me, he, or she say.
I thought AF actually had more dc trains than Lionel or Marx. It might be wise to be ready too. A 10a Brdg Rect. & dpdt toggle and you're set ($10 total after wire ?).
I see some varience in my postwar (O) from ac to dc. Some better some worse. All satisfactory!