wot model golf you intending to fit into? i'm going to assume maybe the mk4?
usually u have 2 x single din applications...one cassette with changer below it...or cassette with pocket below...or cd with pocket below.
Removing both will very much allow for a double din radio to be fitted. However, issue u may or may not experience upon fitting is that altho these JVC radios come complete with their own double DIN locking cages, sometimes those cages sit a lil too tall for the aperture otherwise available on the car, so you end up finding you have to get a replacement double din fascia kit to make it work or try and fabricate a means of fitting it into the hole without the supporting cage supplied.
Otherwise..the second JVC on your list is pretty decent...very much the same as the single din equivalent...just a bigger display realy and bigger knobs n buttons to press.lol