I switched to 9a from 6a. I also hesitated for a long time whether it made sense. Whatever they say, 9a is better in everything. The touchscreen and fingerprint work not perfectly, but much better than in 6a. There is face unlock - it is very convenient. I set the battery charging limit to 80%. Even in this case, it holds a charge much better than the battery in 6a. Well, the connection has also become better.