Welcome to the hobby…
I work in N Scale. Yes, it is a lot smaller. I used to do everything in HO, but it really eats up space. If you are patient, you can get N Scale to do anything that HO can do, but not better. However, in the space that I had a decent HO layout, I have an EMPIRE in N Scale.
Personally, I went with DCC control, so I absolutely have a negative feeling about Bachmann (they are cheap, and once opened, never seem to run the same again. So, when modified, they generally run like trash.)
Atlas, and Kato are the best in N Scale RTR (ready to run.) Look at the DCC digital power BEFORE starting your layout. If you are starting out with a decent layout, it is well worth the investment. DC will require a lot of block control and wiring, DCC will not need all of the intricate wiring that you have to use to move trains in close proximity to one another.
Also, start out with your best possible benchwork. A 1/16th inch deviation in HO is noticable, in N Scale it can wreak havoc on your layout. Work up from your benchwork deliberately. Not slow, not fast, but professionally. Take time to get the right tool, right product, or right scenery material. Don’t fudge, it will haunt you later.
Last tip, if you go with flextrack, buy a xuron tool and don’t ballast till it is bulletproof. N Scale Flextrack is a nightmare for rail joiners, so ask around first about soldering, etc… (personally I soldered all of my layout and it is nearly perfect.)
There is nothing wrong with HO, or larger, but if you want a ton of track in the same space, N Scale can come out looking just as sweet, with room to spare.