Astaka, IMHO has better fields. I think it's probably because they have to keep changing it since so many teams train on it for NPL. And you don't end up with a face full of mud if you dive into a bunker. It depends on what you want.
I wouldn't suggest TT sports to anybody. The paint is bad, the markers are horrible accuracy wise (do they never clean barrel breaks?), they fill their airbunkers with sand (don't slam into one) and their ground feels strange.. like sinky in some parts and completely hard in others. Also, their customer service kind of sucks... waited for ages.
Isi Rimba/Tanamera/Rimba Harmonis would be for people who want to go into the woods. This is okay as long as everyone is a newbie, because it gets really sucky when people with gear are virtually invisible and you stand out, even with subdued colour clothing. The paint is cheaper, but the markers are in really bad condition... sometimes the markers at Isi Rimba have jammed safeties

. Expect to die if you're not in relatively good physical condition, and bring bug spray.
Astaka/Xtion/NPNG are better for more organised, speedball type games. This is probably better for newbies, or those who have no experience in jungle trekking etcetera, it's a cleaner environment, but you do fire a lot more paint. A game in the jungle can last an hour or two, speedball games can last 10 seconds to around 10 minutes. But it is easier to work out more tangible tactics on a speedball field.
Price wise, Xtion is only SLIGHTLY better than Astaka. At higher end, like 500 pellets, Astaka is cheaper. True, you need to pay 60 for marker + mask + field charge, but I'd say that the people at Astaka are generally friendlier. They're willing to help/teach newbies basic skills, at no extra cost.
If you want to talk about pellet consumption, games with less people, evidently, will mean you use less pellets. You also feel like you get more out of the day, since you get more games. Don't bother with 1 v 1, it gets really mediocre because it's literally a 50-50 chance of winning and eventually one person will continue winning... Strangely, playing in the woods results in less consumption too, even on massive scale games...
That's my... 40 cents, or so...