Captive or not and what make? What make and weight of recoil spring (G22 and G23)?
What are your thoughts and why.
Thanks as always,
Sparky
The only failure I have heard about regarding the OEM plastic guide rod is that with enough use/abuse the ebd cap can break off and the guide rod goes flying out the front. Even in those circumstances the pistol continues to function.
I did get one stainless guide rod with captive spring just to see what it was like, but it is no better or worse than the factory one. I figure unless I know specifically why something should be changed it is best to stick with the factory designed materials and parts. The factory rods are so cheap that I can stock several of them for the price of one metal rod. So far the original factory rods show no significant wear after thousands of rounds (G23s and G22).
x2.
I purchased a Non-Captive Wolff guide rod & spring after talking with a bunch of anti-polymer folk. Then I started thinking about gun manufacturers and decided that I should leave the internals as is… If it ain’t broke don’t fix it. And in this case (Glock), even if it is broke - it’ll probably keep working.
Just in case you decide to go with a stainless guide rod, I went non-captive because I like to clean/lube them more than captive ones.
ETA: If your stock guide rod does break for some reason, I’ve heard that Glock will ship you a new one for free. YMMV.
Thanks y’all! I have heard that the factory plastic one flex quite a bit and the guns actually lock up a little better and the spring runs a little straighter using a metal rod (captive or not was never specified) and all that leads to a little “better” accuracy. I know it’s all relative to the loose nut behind the trigger! 
What are y’all’s thoughts on recoil spring weights?
Sparky
The plastic captured springs and rods work fine, so long as you have the coin (~$10) to replace it every few thousand rounds. When I think I’m getting to that point, I buy another. Even the aftermarket ones will need replacing at some point.
I wouldn’t worry about the spring and rod flexing. The entire Glock frame flexes; rumor has it that its part of the normal functioning for Glocks. Its apparently not hurting anything, though.
The factory recoil springs have been working in thousands of Glock pistols for millions of cumulative rounds. It probably ain’t broke. I wouldn’t fix it. Other parts on the stock Glock can use your attention and dollars. Just my opinion
According to Wolff, the factory standard is 17lbs for the G22.