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I switched to an S9 after almost 10 years on iOS, but still use my Macbook, so keeping things in sync was pretty important to me. Turns out, yeah, you keep things synced well for the most part. In some ways even better than iPhone. Here's the setup I settled on:
AirDroid for Texting from Mac / Notifications / File Transfers / etc. There's a few options for receiving & sending texts on your Mac, but I find AirDroid is the most powerful one. It's a standalone app on Mac that handles texting, can receive any notification you'd get on your phone including phone calls (though you can't answer calls on your computer), handles wireless File Transfers (so you can leave the crappy Android File Transfer app alone), among other useful stuff. You only really have to upgrade to a paid membership if you do a lot file transfers, or want to use the app to find your phone, but both Samsung & Google already offer that. The one thing that really sucks about AirDroid is it doesn't support MMS. So if you get a picture or a group text, you're not getting it on your Mac. No notification, no anything. I tried Pushbullet, Join, Mightytext, and others, but I still prefer AirDroid out of all of them.
iSyncr to Sync my iTunes Library I'm pretty insane with keeping my music organized in iTunes, and didn't really feel like looking into other ways handle my music, so I settled on this app to sync my existing library to Android. It's $10 to sync everything, but for me it was worth it. I had issues syncing via USB, so I recommend going via Wi-Fi if this applies at all to you.
I also use Firefox for browsing, Evernote for Notes, Wunderlist for Reminders among other alternatives. But that's the major stuff. Overall it's a sweet setup for me. It's not perfect, but then again neither was iOS. Hopefully that helps!
Lgg4 has removable storage and battery, also you can download an iTunes sync app that keeps all that info. It's kinda big tho
Did you try iSyncr?
iSyncr app(free) - 100 songs/playlist limit. If it works then you can try paid app.
Here's a list of a few different ways to get music from iTunes on your computer to your phone. I've used iSyncr and Android File Transfer. Neither one is all that great, kinda slow, album art doesn't always show up, but I have some tunes on my phone. You don't say what kind of computer you're using, and it will be different if all your music is in iCloud, as opposed to stored on your computer...