First off, I'm a noob. So there's that. :black_eyed:
I don't know what transmitter you are using now but I really like the Spektrum. I just purchased the Spektrum DX6 (for my daughter). I haven't flown with it yet, but my first impression is quality...it just feels great in my hands. Gimbals are very nice and fully adjustable, switches feel good too. Can't wait to use it. Never touched a Graupner so I'm no help there.
On a side note, I have the Taranis X9D that OneFlightWonder mentioned. It's just like everyone says, Taranis can do just about anything, can have up to 16 channels, telemetry, bla bla bla. It does have a fairly steep learning curve. I've heard it compared to using Linux. Online forums and YouTube vids can bring you up to speed fairly quickly though. Taranis only works with Taranis receivers unless you get a module for it.
To me, the Spektrum kind of makes the Taranis feel kinda cheap, even though it cost more. Both have programmable voice functions. I do like the simplicity of the Spektrum compared to the Taranis.