I would say personal preference, but there are a lot of brand loyalist here so they are probably going to choose what they like. In x275 I don't know of many turbo sbc's but I'm sure they're out there. I wish someone would do an x275 LSx turbo I think that would be nasty.
mayhem motorsports out of raleigh nc has a c6 corvette on stock irs running a 427lsx turbo for x275. they havent gotten the buggs out of it is why it hasnt been to races but has been 139mph spinning. i think it has a pro mod 88mm turbo.
id love to see some sb2,or 15 degree sbc turbo stuff before i decide bbc nitrous or not.