Like you, Amy.B, I recently made the jump from an iPhone (6S) to Android in the shape of a Huawei P20 Pro and I'm glad I did. I'm very impressed with the battery life of the P20 Pro, I'm getting a day to a day and a half with moderate use. Unfortunately the last iOS update completely finished off the battery on my old iPhone 6S.
My short experience with my Huawei has been extremely positive and I hope this remains the case. I bought it through John Lewis so if there are any problems they have excellent customer service and I'm sure they will be able to sort it out for me.
I'm sure if you buy a Huawei you will be very happy. The whole OS is very customisable too.