If you are first time convert from Apple, do yourself a favor and explore the real benefits of Android vs iOS before making your final decision whether or not stay in Android land.
1) Download some different key apps than what came preinstalled on the S8: email, web browser, calendar, text. Just google "best xxx app for android" to find some lists. I personally install the following on every Android phone I have: Aquamail pro, Digical pro, Android Messages and Opera mini browser. The great thing about Android is that you can make these apps the default app, so when you click a link your new browser opens, click on an email address and your new email app opens. This is the true strength of Andoid - choice.
2)Download a launcher program to totally customize most things about your phone. I use Nova. Then download some icon packs and apply them in the launcher settings. Google "how to use xxx launcher" and you will find some good tutorial videos. You can totally change the look of your phone very easily using this method.
To me, these strengths outweigh not having iMessage and the slightly better app selection that iOS supposedly has.