You'll get a lot of different answers, many just say "Poly is best as its stiffer, and as they slip they give more flex" Others will just say "Whiteline", I bed to differ on both accounts.
I have been running Super Pro upper and lower control arms bushes on mine for a few years, I'm about to go back to OEM Toyota, and here is why: (Examples for stock IFS, and lift)
Poly by design are firmer and deform less under load, - its part of their selling point. The idea is that the inner sleeve turns within the bush, riding on a layer of grease (or not if Whiteline). This a is nice in theory as it means that when suspension load is applied, there is no "joined rubber" turning and in effect binding, which in theory limits travel.
The issues start to arise when you factor in how out alignment is done, via eccentric cam bolts. Adjust them to reposition the lower arms, and torque up and hope they don't move. Poly Bushes leave you with two distinct disadvantages here.
1, They are designed to deform less, so more shock loading will go onto your eccentric cam bolt, and increase the chance of having your alignment knocked out (I have experienced this)
2, When you adjust the alignment, you will very rarely adjust the front and rear cams to the same setting. (in fact it is known practice to try and increase caster buy doing exactly this, to give better front wheel clearance).
If you imagine a straight virtual line drawn between the lower bushing bolts (or for a better analogy, imagine the top with that long bolt), the poly bushes move nicely as the arm moves up and down, sliding on their inner shaft, not deforming, giving controlled travel. As soon as you introduce a different adjustment, that straight line is broken, and for the suspension to cycle up and down, you are relying on the naturally "less prone to deform" poly bush to deform. Which introduces more bind than a wound up factory rubber bush, in good condition for "most" of its usable range.
Now factor in when the bush dries out (they do) it is annoying and squeaking, and binds even more. When I removed my front CV shaft, on the passenger side, the lower arm was so hard to push down I had to use all my weight. It went eventually with a groan, and threw the alignment out! - the adjustment bolts were tightened up to the correct torque.
It was at that point that I decided I want to go back to OEM for the lower arms for sure. Not only to OEM compress better, but they allow the central shaft to twist slightly on an access perpendicular to natural suspension travel, making the suspension cycling more natural when the lower bush misalignment is taken into account.
That argument doesn't stand for the upper arms and rears, which in theory as long as the bush is a perfect fit won't have this issue. I personally have decided I want OEM anyway, they lasted well for the fist majority of the trucks life. I run a Toytec boss kit on standard control arms all round (apart from front upper, that's light racing adjustable), in reality I don't have much more usable travel than stock (larger wheels, and the lift means less droop) so I am happy that the factory rubbers will have more than enough free movement for my useful suspension travel range, while cutting out some NVH in daily driving, and being silent without needing regreasing (which is a PITA job, especially for the lowers)
I was tempted to try Whiteline bushes as they have good reviews, and I like the idea of the coated insides that (claim) to not require any grease and remain smooth an silent, but this still doesn't address the lack of deformation.
I DID have Whiteline sway bar bushes, I tried to use them but the fit was poor (they are the same size as the factory rubbers, and don't compress as well, I had previously used Super Pro ones which fit perfectly, but squeaked after 5 minutes... well a year... or something)
I'm sure plenty will disagree and provide contrary experiences, but I've been there, done that, chosen to go back. I always take into account that lot of people may express an improvement when comparing 20+ year old factory bushes to new poly bushes.
Happy to update again once my front end rebuild is don't back to "fresh Toyota", with exception to the LR/SPC upper arms as factory won't fit, and Toytec lift. I'm even removing my rear adjustable Poly/Heim control arms, I ran them at factory length anyway.. they looked nice but added nothing more than that (and extra noise) so new factory upper arms, and rebuilt lowers with new factory bushes (and POR15).
