Which one do I buy? Advice please

Payload is one of the main reasons we have hung onto our current van.  We have 345kg after the up plate, though that does have to include the gas bottles as it is an older van.

Yes had a look, really liked the one however there didn't seem to be much worktop space for cooking. No lift up side bit or anything. We will be cooking a lot in the van so it has to be right.

I have a Touareg and also tow 1900Kg TA with no problems. I agree with remarks regarding TA stability advantage and the other creature comforts of a TA like a big fridge etc. My only issue is the pitiful payload or user allowance on some TAs. I opted for the Powertouch AWD mover and it certainly moves the van with no problem. Unfortunately it eats 60Kg of user allowance. In retrospect, as I don't visit ploughed fields or use the mover for 20% inclines, I would have been better off with a single axle mover.

Regarding fuel consumption, I tow at or near the legal speed limit and usually get 23-24mpg depending on the weather. I seem to recall that with a 1500Kg SA van I used to get 25 or 26 mpg in a lighter diesel estate. So not much difference in my case. 

Before I start a debate about caravan manufacturer choice, you might want to look at the annual Practical Caravan reliability survey (might be a slightly different title). My personal experience with two new Baileys has not been great, however, maybe I was unlucky or they have improved now. Unfortunately, very little objective data to go on outside the Practical Caravan survey. Personally, I prefer a TA, but also factor in slightly higher service costs and probably insurance as it is based on caravan price.