Absolutely. I will try to lay out the pros and cons for each option!
Option 1: Switching to Flex
If you switch to flex, all of the daily data from your local weather station will be used to determine your schedule, along with your zone settings. We have tons of customers who have had great success with flex, the key to being successful is those zone settings. The people on this forum can be incredibly helpful when it comes to getting those tailored to your irrigation system. I would say that the number one "con" with flex is that it requires extra time and effort to begin with in order to be successful, it's up to you if that is something you are willing to try! The pros with flex (when set up correctly) can be pretty awesome. This idea of managed allowed depletion is actually the "correct" way to water your lawn as it promotes root growth, reduces watering frequency and results in a healthier, more drought tolerant landscape. Basically, it has the potential to save you money and make your landscape look better!
Option 2: Switching your Weather Station
Your historical ET data actually comes from your lat and long coordinates of your controller, so switching the weather station will not affect your seasonal shift. This is actually better, because what we can do is switch your controller lat/long to the closest place within the US to your location, but keep your weather station the same. This way, your rain, climate, and freeze skips will all be based on the weather station close to you and be more accurate. Only the seasonal shift will be based on that "incorrect" location. This would be less work to set up for you, and it would also be sticking to what you know works well for your landscape now. I would probably check to see if the location we would switch your lat/long to is a good comparison for the weather you typically experience at home.
Bottom line, I am a little biased to flex because I think it is a great way to take full advantage of your controller. However, it is a little more "risk" in the beginning and definitely more effort. Switching your location would be a quick and easy fix to make sure you get the benefits of seasonal shift!