Everyone has their opinion, but for me the ED30 seats are great, so confy and hold my average frame nicely when chucking it about, if your a true fan of GTI's and like the retro interior (I do) then you will get one for that and for tuning potential.
Like the guy above said he prefers the bumpers not colour coded on the GTI as opposed to colour coded on ED30, but if the bumpers are not colour coded it might as well be a 1.6fsi match or 2.0tdi, only stand out from MK5 are the Ed30 and R32 (Drink fuel and no quicker than ED30, found that out yesterday after my neighbour in his R32 saw me behind him
).
R32 sound better and i like the single exhaust either side, but you can get a rear skirt and after market exhasut like that anyway!.
GTI for everyday and money wise, ED30 for Looks/Retro and tuning potential.
And yes i did try a GTI out of curiosity before buying the Ed30 and I also drove my neighbours R32 a few months back, great grip off roundabouts, but felt very cumbersome to me (It does weigh almost 200KG more than ED30 and only has 19bhp more, believe me that 19bhp is LOST in 200KG extra weight, only benefit to R32 would be wet/slippy roads and snow conditions i think.