I own a BTB405 and an SR400.. The truth is that I find the feel and tone of my SR much sweeter then any other bass I've played, inc. the BTB.. I've played other SR's (4, 5 and 6 sstringers) and they just were not the same. Maybe is the strings and how I have the bridge set up, or the fact that it was my first and only bass for 4 years.
But well my Favourite ibanez would be an SR3000 with a Btb neck.. I voted BTB..