Opinions on 4 speed with OD

Curious what makes you favor the OD over the Tremecs? Difficulty of install not worth the extra gear? Something else?
I haven't called passion yet but they advertise the transmission at $3,600. No shipping as I will pick it up
What im hoping is he will offer me something for my 23 spline rebuilt 833
The Tremec while im not ruling that out is 5 grand plus another 300 for shipping, so im looking at around 1700 savings plus no modifications to car
I can do any modifications and the Tremec is a heck of a lot lighter than the 833 so that helps
I really have to talk to Passion later
Will let you know soon as I find out
Thanks for advice