Well RTW is a later game and so has more features, unfortunately it also threw away some of the good features from MTW.

The battles though which are the main draw of TW games are also the main problem they ARE inferior to MTW, they've been dumbed down considerably so that they're over far too quickly the AI is also inferior to MTW (which is really unforgivable IMO) and battles require no where near the level of thinking or at least planning that one needed for MTW which is a real shame.

The game is still worth it I think as it does have a nice variety of factions to choose from and some of the new strategic features are nice, however if you're not sure then perhaps you should wait until the expansion is brought out or some mod comes along that restores the quality tha MTW presented to a player and you can ask other fans for some feedback before spending your money.

I don't dislike the game, I certainly enjoy it but not as much as I still enjoyed MTW when I had been playing it for this length of time.

So to answer the question plainly, no, RTW is not better than MTW.