Are you wanting to use the fire as actual heat, or essentially as an ornament that happens to be hot? And, how often are you planning to use it - every night, or three times a year when Great Aunt Ethel visits?
My extremely limited experience of smokeless fuel is that it's a fair bit less satisfactory than either proper coal or dry wood - not as attractive to look at as it burns, and not as hot, as well as being more expensive than coal.
Unless you're using it as regular heating, you're unlikely to use enough to make deliveries worthwhile except maybe from a local retailer, so your choice is likely to be limited to what's available locally at petrol stations or hardware shops - I suspect that the different brands are much of a muchness.
The odds are very high that if you're only using the fire occasionally, you will never be challenged if you use coal and/or dry logs, and that's probably what I would be inclined to do. Given that the idea of smokeless zones goes back to the Clean Air Acts of the 50s and 60s when there were far more domestic open fires than there are now (not to mention industrial air pollution), that's not nearly as anti-social as it probably sounds.
(As for usage - really don't know. Three or four nights out of a bag unless you're being a real pyro?)
