Hi Valentino, I bought a Giant Explore E+ about a month ago, and am really liking it! I remember a few differences between 2018 and 2019:
- I read that early 2018 models may have 3 speeds while late 2018 and 2019 have 5 speeds
- 2018 had an lcd display controller, 2019 has a simple controller called "Giant Ride Control ONE" with leds to indicate boost and battery level. If you want to see details on current speed, cadence, etc... you would have to use mount your smartphone to the bike and connect with bluetooth.
- I think 2018 3 speed models supported cadence to 100, while the 2019 supports 110
- I think 2018 3 speed models had max boost of 300%, while the 2019 max boost is 350%
If you can get a great deal on a 2018 that has 5 speeds, you're probably getting the same motor as the 2019. If the 2018 has only 3 speeds, the 2019 might be worth the extra money.