Even though I got my X5 at a greatly reduced price I was in the same space as you trying to figure what to buy when the time came, and as stated earlier by more than one I had to go with the Gaui on the price point alone, for parts ( which we all know is inevitable) and availability of them here the standard Gaui spares are similar in price to the Align vs the Goblin which are less accessible here and are more expensive overall.
In all honesty at my flight level, with no real 3d, I probably would not be able tell the difference in flight characteristics between the two. So, the only deciding factor was it had to be a better machine than I was flying now which was the 450l, bigger with more capabilities to fly almost whenever I wanted and as affordable as possible when all the others factors had been met... last ship standing was the Gaui . I had considered Goblin, 380 ...Align 550l, Chase 360 and since the size of the 360 and 380 were similar to my 450 I stood aside ...if I was going to step up in size, the options are reduced and the price exponentially shot up.,,,Gaui it is...
Based on my build to date, I like what I see in terms of fit and tolerances..(this machine is tight) I do believe the Manual and instruction of the Goblin are much better than my fugly Gaui ones

but if you've paid for the glossy colored pages you should get em... however if your building a machine this size, its not your first and you should be able to work through them pretty well.
My to cents, if you can afford it you buy what you personally like from every aspect ....aesthetics included. I have not found any complaints from either camp as of yet.