yeah oem are best for reliability but they have their downsides also.
With aftermarket turbos you compromise on reliability, but my setup has oem like reponse and on a low boost 98 map mid range is 19 psi tapering down to 18 psi at redline. Based on virtual dyno its making ~ 330rwkw and is a lot nicer to drive compared to oem twins on 98.
At the end of the day it depends on your budget and be realistic with your budget, to be frank most guys are best to just do fresh oem turbos and spread their cash out on a complete package (LSD, coilovers, maintenance, tyres, rims) rather than make 400rwkw on oem suspension, driveline and crap tyres. But if you have the $ to splurge go for it
