lag and such all depends on the size and type. A small turbo will spool up very quickly, where a larger turbo such as a t60, will take longer since it's bigger. A centrifugal blower would be exactly the same way, plus it's parasitic, adding onto the drag of your belt driven accessories. A roots blower (what's on the MN-12 SC's, GTP's, big cubed v8's) give you 100% boost right away, but for cars such as the tour and taurus which suck for traction, it's not a good idea. Roots blowers are best on RWD cars. I'd say go for the turbo, there are many more selections to get the setup wanted, and you can do them for cheaper if you hunt around enough.
