The TicWatch E3 gives you Wear 4100 power for a much lower price - Android Police

And they really are; the TicWatch Pro 3 is a behemoth with its dual display and large battery.

The TicWatch E3 is ever so slightly smaller and also significantly lighter, so that may make it more desirable to many.

Aside from those specs related to form factor — smaller display, no dual functionality, smaller battery — much else remains the same, including RAM and storage, so performance should be on a par with the well-received TicWatch Pro 3.