Electrum and 🔵 Bluewallet are the best in android or mobile devices but I saw some dichotomy between the two. Electrum wallet does not work in Iphone but 🔵 Bluewallet works in android and Iphone devices and another thing is Electrum wallet is easier to use than 🔵 Bluewallet base on UI.
And all the people I know around my region who are into bitcoin investment or trading are using Electrum wallet. And any updates (software update or upgrade) the developers do, it has effect immediately on the android version of the software. So you are right that they're not separately operating but it is an integral part of the software.