I had the same dilemma a few weeks back. Whoosh seems to be a Depo/COBB/MTC clone. Only advantage with Whoosh is that it comes in black (or unpainted) which is why I would consider it over Depo since I want a black IC. Plus Depo intercoolers weren't in stock the last time I checked.
In the end, I went with J-Line though. I like the look better, less common, I wanted the challenge since I like DIY, and on the off chance I might actually upgrade my turbo one day, I'll at least be IC ready. J-Line is on the way, I'll probably get it sometime this week.