I’ve had both. There is only one major pro to me with the 8+, and that is that it’s got a larger feel in hand. The 8+ is 5.5”, while the 11 is 6.2”. The 8+ is a bigger physical device thanks to the bezels. The 11 is faster, newer and has a WAY better camera if that matters. People always come into these posts and claim they hate Face ID and can’t give up Touch ID. The fact of the matter is the 11 is better for nearly every consumer. You will get a been there, done that feeling if you get the 8+. Grab an 11 and enjoy it until the iPhone 14 or 15.
I prefer TouchID over FaceID, so that's why i choose the 8+ over the X when i had the choice.
I have compared my 8Plus with the 11, and although the colors on the 11 are warmer and brighter, it is a little less sharp compared to the 8 Plus (due to lower resolution screen). Now I know, most of you don't care about that, but using the 11 next to my 8 Plus it started to annoy me a bit. So yeah, it is noticeable.