I bought an 8335 this year and it is wonderful.
I had a look at the reviews of 6335 on Trumpet Herald forum and lots of positive comments.
I also had a look on YouTube. Type in Yamaha 6335 and several videos are available.
I personally think it is best for beginners to go for a decent trumpet from the start.
My brass band lends out high end cornets but I would be wary of trying to play trumpet and cornet. I find the trumpet much easier.
Best of luck
Colin