The Fensport turbo kit used to be a lot more expensive, they brought the price down not long ago to be more competitive with the TD kit, which when it arrived blew the others out of the water on value.
Personally if I was going for a turbo, I prefer the design of the Fensport kit with the turbo mounted low and keeping an enclosed air filter so less heat soak. Also Adrian has done a lot of track development with it's design in sprint series, and supports those series financially. I believe the cheaper AVO kits have less headroom for power increases than the standard TD turbo units, though - and the TD is dyno mapped, which is nice to get real data on the improvements beyond the arse-dyno.