I went with the sixth catch can its a nice peice of kit! Only complaint is you have to open it to see the level. But I just dump it every oil change and after track days. I looked at boomba stage one and stage two and they don't really list a difference on the website?? Price is also the same so I guess stage 2 just comes with more street cred!!
I found that I got nothing from the intake side and removed the can. Ten months without a drop of oil. I have a PCV side can which collects junk. I have an extended tube and valve so I drain at every oil change from the bottom of the car. Has anybody else accumulated much from the intake side?