Unless you just don't want to spend money to own two phones. having both is the best thing ever.
email on iPhone smokes anything any android phone offers. and you don't have to have 2 separate email apps on iOS.
Both have some good and bad. I do agree apps are simply better on iOS. I have both iPhone 6 and Note 5.
When you get bored with one, throw sim in the other and go. I have both of mine active and carry both.
If you don't like the over saturation, samsung has multiple settings for the screen that sets it very color accurate.
I find that the apps may be more refined in ios , however they are also more limited, for my needs :
[ ] Sometimes it takes a while after reading an email for the count tag to be reduced on the home screen*
[ ] Swiftkey keyboard cannot be resized,no number row,some security switches back to stock*
[ ] Gmail cannot be set to auto jump to the older email after deleting current email*
[ ] Stock email app can only be set to 15 minute fetch at the quickest for Gmail
[ ] No button to delete email in the in box in the stock app, must long press the archive button spps
[ ] Kick*apps*out of memory when running in the background . for example when downloading pictures from amazon photos, it will stop every 60 to 100 pictures or so and I would have to open the app again,youtube uploads stop when app isn't open.
[ ] No double click to open camera*
[ ] Gpm streaming stops occasionally*
[ ] Using Swiftkey,sometimes you can't see what you are typing as the keyboard blocks the screen where you are typing*
[ ] Cannot set the iPhone to switch to vibrate automatically when in a certain area(note 5 can do this with Tasker or similar*
[ ] If you use a lot of*apps*then the system would start to get laggy and crash prone . you can force close allapps*once in a while to help mitigate this,as well as shut off and re start the iPhone.
[ ] Also with a lot of*apps*in memory, background usage for uploading and downloading is severely limited. For example, Amazon photos or youtube can do some uploading in the background when all*appsare cleared from memory or when few*apps*are in memory. But once you have a lot of*apps*in memory, the*apps*need to be in the foreground to do uploading.*
[ ] Both amazon and Google photos has the option to upload only while charging on the note 5,but not on the iPhone.*