Smaller vs larger screen seems to be only significant difference really. Unless you're doing something where a few fractions of a second aero-ness makes any difference. I mainly went for Bolt because it was a bit cheaper.
Screen look better, but normal ELEMNT battery is great, and more screen estate is great as well as the LED (very useful for turn by turn, funwirh Strava segments).
Is the general consensus to get the Bolt over the original Elemnt? Not fussed about aero-ness as it will be stem mounted.
Feel like there must be some feature difference I'm missing but it looks like the same thing in a smaller pointier box.