What style fittings should I be buying for my return line, pushlock or the twists?

Whatever suits your application. What are the fittings on your turbo and oil pan? NPT? -AN?

I am buying everything per this link I found in search the diagram is what I am using for the feed and one post below I am going on that for the drain. Its a t3/t4 turbo and I plan to get a male weldable fitting for the drain. Any help you can give would be great

http://forums.2gnt.com/dcboard.php?az=show_topic&forum=8&topic_id=101693&mode=full

So you are asking what style hose to buy? Whatever fits your budget and capability. If you do not want to build your own AN hose then get the push-lock style. The turbo oil drain is a gravity drain so a barbed fitting works fine.

i use a braided high temp silicone based hose. 5/8"

What I was trying to figure out is if I want push lock barbed fittings or twist lock which seem to cost a little more.

whatever turns you on

Is there a difference, one being better than the other or holding up.

As much of a shameless plug as it is, check my FS post if you need an oil drain.