Welcome to SMF engineman! I don't know if there are any comparison reviews on this site, but they are both reviewed separately:
The smoke n grill needs quite a bit of mods to be a good smoker. If I was going to buy one or the other, i would probably buy the gourmet model.
None of them have reliable thermometers so you would do well to go ahead and purchase a good dual probe thermometer so you can probe the meat and also measure the cooker temps.
If you like to tinker around and you are fairly handy, you might want to consider building a min WSM which consists of a Weber Smokey Joe and a pot cut to fit. Not sure if those would be available in the UK?
Ask some more questions, I'm sure you will get lots of answers!