I've owned every model Note 1, 2 and 3,,,,,and also I think all the S models.
Never had a problem with my switches aside from a few days to get used to the smaller screen size,,,, a few days ago I got rid of my Note 3 and went to the S5 and no regrets at all.
Love my S5 and might get the Note 4 when that comes out (I switch phones a lot).
On a side note there is an Play Store app called "Smart Switch Mobile",,, it takes ALL your info from and transfers it from one phone to another,,,, pictures, videos, contacts, settings and everything!!!,,,,the app is amazing !!!
Load the app on your Note 3 first, go to your carrier and load it on the the S5 your getting, set the two phones next to each other and select send and receive on the phones,,, in a few minutes everything is transferred to your new device,,,,, GREAT app for phone switching !!!!!
Cheers
Davyo