When selecting any system try to find a place to try it out first. The key part is what goes in your hand is comfortable for you and only you can answer that. Our layout is large and DCC. Yes most loco have some backup power in the loco (small batteries or supercaps). We do that to completely avoid any problems in ops sessions which can last 3-5 hours. The 10 amp power stations are best for DCC when you consider growth.
Should you need NCE 10 amp ones I have several extra ones available at 50% of list.
Stan