I am 100 procent with Erik on this one.
Spend time in doing a an upgrade to NAV 365 bc onPrem and then when microsoft releases the tool to syncronize everything - then do it. Rapidstart will simply take a century to complete
You also have to remember:
- In the cloud you cannot control the updates that Microsoft do
- In the cloud you cannot do a SQL-backup if you need it
- In the cloud you have to write every change as extensions - and you have to make a plan on how to do it (1 Extension pr customer?, Function area? group of customers?
And there are many more things that differ.