Hi, this is purely personal preference. I have actually included both maxes in my guide (see the tabs) I like to max E because it increases the damage greatly, which Pyke sometimes lacks early game. Level 1 E deals 95 base physical damage, while level 5 E deals 215 base physical damage. In addition, E max is good especially when you are not roaming much during laning phase.

However, W max is also extremely viable. It not only lowers the cooldown from 12 seconds (level 1) to 10 seconds (level 5), it also increases the % movement speed from 40% (level 1) to 60% (level 5). W max is much better for roaming, but I personally like E max better due to his already insane movement speed from mobis/swifties and celerity/waterwalking and that E max gives much more damage.

In conclusion, it is really up to how you want to play your game, your matchups, and personal preference. I do switch between both maxes in my games when I think one will be more effective than another. Thanks for reading my guide!