In terms of Cloud accounting packages, Xero (www.xero.com) comes well recommended. I would avoid sage in any form as it is far too complex and designed for accountants.
Here at my organisation we run on AppleMac with AccountEdge by Mamut software (https://www.visma.co.uk/accountedge/), which I believe is the same code platform as MYOB. This is the only decent accounting package for Mac (having wiped everything else of the Mac platform as it left everyone else in the dust!).
For the Windows platform, there is Mamut One or Visma, but I can’t really say much about these other than the come from the same stable as AccountEdge. Given you are in the US, not sure if any of the fixed platform I know of would be much use.
Given that, I would recommend you take a look at Xero as it supports multi-currency, is web-based, with phone app capability too. They offer a free trial and the basic package is not too expensive either.