I have a s8 + phone but I do not know which gimbal to buy. osmo plus or just the osmo mobile?

Sir, thanks for your support. Samsung Galaxy S8+ is in our recommended list. I would recommend you see the difference between the specs of the products from our website: https://www.dji.com/osmo-mobile/info#specs (osmo mobile)https://www.dji.com/osmo-plus/info#specs ( osmo+). They have different feature. Or you can tell us your demand for further suggestion.

That depends on your needs of course.
I chose the mobile and am very happy with it!