Handset Choice/Price?

[whites75]

When I got my first car several weeks ago I bought the Spektrum DX4C wheeled handset, which came with an extra receiver which has since been put into my sct I recently got.

As you know handsets can be VERY expensive but what I am unsure about is what would say a more expensive handset do that my current one doesn't and do they actually make the car feel or handle any different? Just thinking ahead for when I get another car(s) do I need to pay more for a different handset than my current one and if so why?
cheers