I am sure this is a loaded question but... Pros & Cons between the FrSky and RadioMaster? I would rather have something that I can use through a few models.
I was assuming that the Spektrums were the higher end units.
Also input on models for each.
I have only ever owned Spektrum and FrSky and I bought those a number of years ago, so the information I have on others may not be entirely current.
The software used on RadioMaster, FrSky, and Jumper radios is open-source and designed to give the end user a lot of flexibility for what the radio can do. The downside of this is, you need to do some learning to figure out what the various settings do. I guess the newer radios are a little more intuitive than my old Tarani. Something like a Spektrum radio is designed to be a little more straightforward when it comes to programming, but that also means it limits what you can do somewhat.
If you want more than 6-8 channels, Spektrum radios get real pricey real fast. The Spektrum NX-10, 10-channel radio costs $550.
A Taranis QX7S can handle up to 32 channels and costs under $200 (it looks like these may be getting phased out for the newer Tandem radios)
A Radiomaster T16II radio is about $200 can handle up to 16 channels, and is available in a multi-protocol version.
A big selling point of RadioMaster (and I believer Jumper) transmitters is that they are available as multi-protocol radios.
That is to say, they can connect to almost any receiver, from Spektrum to FrSky, Graupner, to even cheap little no-name micro quads.
I was able to buy an external module for my FrSky Taranis which lets me do the multi-protocol stuff, but that's an added expense/complexity vs the RadioMasters that have it built in.
If I was just starting out and thought I would stick with the hobby and had the money to buy a radio that can grow with me, I'd look seriously at a RadioMaster.