Huawei band 3 pro or 4 pro?

I would like to buy a new fitness tracker. Since fitbit does not work with my cell phone, I now use Huawei.

Only I do not know exactly whether I should take band 3 pro or 4 pro has someone experience? Generally what they both can do. Don't be smart if you also show me a notification like what's app like Fitbit.

Since both are so cheap, I recommend the 4 Pro for just under 60 euro. It has a sleep quality monitor, a heart rate monitor and a very, very good performance!