I'm torn between the 2 for my next oil change in my Jeep. Please offer suggestions to help me make up my mind.

Thanks!

I'm planning on trying the Ultra 5w-20 in mine next oil change. What do you use now?

I've got M1 5w30 in there now.

Try ultra, and then get a UOA. I'd probably get some myself if I didn't already have some Valvoline Maxlife blend 5W-30 lined up for the next oil change.

I'm running 5-20 ultra right now in our 07 5.4 and couldn't be happier. I should be ready for a UOA in a couple weeks

fsskier, who post here uses M1 0-20 with very good results. Several engines with 200-300K, with very long OCIs.

I use the M1 5-20EP in both Fords. Good results with that.

M1 0W-20 is clearly a superior oil to the PU 5W-20 in every regard; there's no contest. PU's VI of 158 is unacceptably low for a synthetic oil.
If you want an alternative to M1, consider the new Castrol Edge. Even their 5W-20 has a higher VI at 175 to MI at 171 and CE's 0W-20 blows them away at 220.

O/20 is my vote,i like 0w oils,great oil.

You're basing superiority on one thing, VI?

Seriously! You keep doing this over and over. "Unnacceptably low", how so?

Seems 5W-20 and OW-20 (!) Oils are good for Loooong mileage Engines, or rather High Mileage? Why so?

Redline 5w20 is widely regarded as the most robust 5w20 on the market. Has an HT/HS of 3.3. A noack of 8. And a viscosity index of a whopping 145. By your standards it must be a pooey oil.

You can check out my opinion in detail on RL's 5W-20 grade in the recent VOA posting.
But basically it is a 30wt oil in all but name and it's hard to imagine any 20wt application for which this old formulation is suitable. RL's own 0W-30 is a more modern and clearly superior formulation that is actually lighter at all start-up temps as high as 90F and is equally shear resistant.

He just hates Ultra and it mad that people want to try something new, so he makes a comment on how it supposedly sucks in every thread where Ultra is mentioned.

All of what you said is fine, however you didn't directly address my statement. Your classification of the 5w20 variant is irrelevant, please explain how you decipher quality oils from the viscosity index.

Redline 0w20 = 166
Redline 5w20 = 145
Redline 0w30 = 183
Redline 5w30 = 162
Redline 10w30 = 142
Pennzoil Ultra 5w20 = 158
Pennzoil Ultra 5w30 = 169
Pennzoil Ultra 10w30 = 156

Are you to say all these oils minus the 0w30 are not good oils due to their "subpar" viscosity indexes? By your standards, the Ultra line is superior to every equivalent grade Redline oil.

PS - No I'm not a Redline pimp, just using an oil everyone can agree is very highly regarded for comparison & to make a point.