there is no "best" system in my opinion. They are all good. They all have some differences that appeal to one person vs another.
that said, the best system for you is what might be common among your local fellow modelers if any. If you know some guys locally that have DCC find out what they have. Assuming they are friendly, if you get the same base system, you will have a support group to ask what you have questions. My experience is that when getting started you have questions whose answers are not obvious from the instruction manuals.
As you know, DCC is an open system, so any brand decoder will work with any system - the caveat is "compliant" decoder. there are a few off brands, that do not always follow the DCC standards. I think NCE and digitrax and some of the others offer plug and play decoders. Most seem to offer them for Atlas. Remember, after you install one, it will be delivered with the default address "3". You have to program it so some other address, which most people use the number on the side of the loco.
Lenz, NCE, Digitrax, MRC, and CVP (EasyDCC) all market base station systems. Lenz does not offer radio throttles, but CVP offers them for Lenz. EasyDCC used to have problems with radios when using more than 7 throttles. That may be cleared up or unimportant to you. MRC seems to offer lower powered basic systems that may have too low a power rating for your plans. NCE and Digitrax all offer multiple throttles and radio options and different power ratings.
As for rating, it is based on how many locos you might be running at once. I have no idea what the amperage draw for a typical N Scale loco is. I'm pretty sure it is .5 amps (1/2) or less since many newer O scale locos are in that range. So if a system is rated at 5 amps, that would easily run 10 locos at one time without any additional boosters. Digitrax has an 8 Amp max and NCE has a 10 Amp version. Not sure about the others.
therefore you can determine what command station and boosters you need based on how many amps you expect to draw - ie how many locos you will run at one time. the rest of the decision is based on how you like the system throttles.
I personally have a digitrax system. Mine is an older version with simplex radio and is still working fine. I have on master throttle that came with the system. I have then added a bunch of the smaller engineer throttles that I use for running trains. They have a large knob for speed, and a forward-reverse switch with center off. I like both features.