Would you say it's worth waiting to buy a S9 when the S10 is released, as the S9 price should fall (rather than buy this month)?
Also, if buying a S9 would it be cheaper buying and doing SIM-only ? I also do not want to be tied to a contract for 2 years
In terms of a contract, I have a sim only deal, where unlimited data is my primary objective. I buy an expensive phone to go with it, but make sure it is well looked after, and I'll stick with it for five years or thereabouts.
This suits my financial and personal circumstances though. It is not the way forward for everyone.
Regarding choice of phone, for me, I like the idea of using a stylus. This is because I do a lot of note taking and recording minutes of meetings. Also, like an earlier post on this thread, I'm a little bit obsessive about fingerprints and grease on the screen, and I think this will help.
The release of the Note 10 might well have an impact on the prices of the previous versions, but at the end of the day, work out what will be best for you, based on your circumstances.
A few posts back in this thread there was mention that some phones are only supported with software upgrades for two years or so. I've not found this to be the case with my iPhone 6+, which I got new about five years ago. This is something that I will have to monitor as it could affect my future purchases if Samsung operate this policy.