Welcome to Android Central! I agree that the 4 XL would be ideal, but it might be hard to find that phone at a decent price, even this far out. (You could probably find it for a decent price from Swappa and other private seller sites, but the caution there is that you are much less likely to have any kind of warranty or other buyer protection.)
People I know who have the 4a or 4a 5G (which has a bigger screen) have been very happy with it. Although the specs are lower on paper compared to the 4 and 4 XL, the performance and battery life are still quite good, owing to Google's optimization.
What a tough question! It's hard to choose between the two! I think the Pixel 4 *may* be a better all-around device, but I don't think you could go wrong with either!