I have a TD05 18g and compared to a 23 or 22 both of which I have had its a lag monster, really good once it spools but rubbish for street driving, really needs avcs or the bin lol. I did lots of research before I got it and the 18g was meant to be one of the best turbos to get, after driving it Id never get one again, in fact Ill be going to Garrett later in the year which has been proven to be very very good.
I have overlayed the 22 (red) and the 23 (orange) that I did have, the 23 was on a std ecu, the 22 was on wastegate boost but tuned. The other 2 are the 18g (blue line) and the bolt on Garrett that I will be going to (green line, graph was from another car with fairly similar mods to mine)