I've only tried 4 brands;
Sienna X - I found too orangey and didn't fade off particularly evenly.
White to Brown - nowhere near dark enough, but they used to do a lovely shower gel which they may have now re-branded (I bought all the remaining bottles when they were reduced in my local who,sealers!)
Moroccan Tan - tried ORIGINAL and Nights and Dusk tans. (For darker skin tones). Like the fact they have shorter development times but found the results a bit unreliable. Sometimes the tan would look great and last really well and other times not so good. Found the Nights and Dusk didn't apply evenly and looked really patchy until rinse off, but the developed tan looked great.
Crazy Angel - been using this tan for over 6 years now. It would be nice if they had a violet based tan however I don't find it too orangey anyway. Clients seem to love it and it's one of the more reasonably priced tans. Would definitely recommend giving it a try.
I keep meaning to try LA Tan, but I stocked up o. So much Crazy Angel at the last beauty show I won't really need any more until spring!
Machine wise, unless you are planning on doing loads of spray tans every day, I think the TS20 is a good, reliable and compact little machine. Mine is 6 years old I think and I haven't ever had a problem with it. I do beauty and nails as well so it's not in constant use but it's certainly used regularly over the summer months!