So I should get my Nitron shock here in the next couple weeks and it has the hydraulic preload adjuster but I didn’t get the remote reservoir. i ride 95% Street most of time right now with some canyon carving on weekends so I didn’t think I really needed it. I’m not touring on the bike or riding off road. I think it’s a better overall shock design to have it it’s just a matter of cost. here is some basic resovoir info i found useful.
Michael Hayes talks about remote reservoir shocks for your 4WD. They are designed with an external reservoir that increases fluid capacity. Read full article.