Well, you cannot go WRONG with any name-brand full-synthetic in 5w-20. I would not throw rocks at anybody for preferring Mobil 1, Castrol, Valvoline, etc. But, if you wanna split hairs - and let's be real here we love our cars so we're going to split hairs - there are several specifics to consider when it comes to oil choice.
First and foremost (for me) is the NOACK (mass loss/volatility) of the oil. This is the oil's tendency to "bake off" under high temp. The lower the NOACK score, the better. This has obvious benefits in regards to the PCV system and contamination of the intake valves on our direct-injection, turbocharged engines. Pennzoil Ultra Platinum has a 6.6% NOACK score, whereas all of its common competitors are >10%. Even AMSOIL Signature has an inferior 7.6% score. But, this is just one thing to consider.
Next, the viscosity - Pennzoil Ultra Platinum leans toward the lower end of the viscosity range for its ratings. Yes, 5w-20 (and others) are not a singular, set-in-stone viscosity rating. Leaning toward the thinner end of the spectrum makes for better cold starts, performance, and potentially fuel economy (although I would argue that this last point is negligible and your driving style has such a larger impact as to render this moot), but being on the lower end of viscosity makes the additive packages that much more important (more on this in a moment). If you have a high-mileage engine, you'll want to opt for a thicker oil, preferably a high mileage specific oil. High mileage oils will lean toward the higher end of viscosity for their rating and will also have seal conditioners that will swell your old seals to prevent leaks.
Now, additive packages. IMO this is also where Pennzoil Ultra Platinum shines. Pennzoil UP has a higher-than-average content of Zinc, Phosphorous, Calcium, and Boron, an average content of Titanium and Molybdenum, and a lower-than average Sodium and Magnesium content. I won't go into detail on the specifics of each except to say that Zinc has fantastic anti-wear properties for your bearing surfaces. If you believe that our 1.6l EcoBoost engines prefer a high Titanium content, then by all means go for the Kendall Liquid Titanium/Motorcraft full synthetic, as they have the highest Titanium content that I have seen, but are fairly typical in every other regard.
The next thing you want to consider is "high temperature high shear" or HTHS. HTHS is the ability for an oil to perform under extremely harsh conditions inside an engine by maintaining viscosity under very high temperature and high friction scenarios. Finding specific HTHS ratings for each oil is a bit tricky, but the cliffnotes on this is that the higher the rating, the better. Pennzoil UP has a 3.1 HTHS rating, as best I can figure. This is one rating where it is actually beaten by some other oils, likely because it is on the thinner end of its viscosity rating. For instance, Mobil 1 has a 3.5 HTHS, if I recall. How much does this matter? Well, it's kind of a ballpark figure and is something for you to decide. Thicker oils will generally have a superior HTHS score, so bear that in mind. It is also worth noting that government regulations pushing for lower viscosity oils and better fuel economy and emissions are causing HTHS ratings to lower across ALL oils and oil companies.
For me, Pennzoil Ultra Platinum checks enough boxes to make it an easy go-to choice.
And for the record, no, I am NOT sponsored by any oil company. But if any are reading this, hmu bb