QB Issue Resolution:

I suspect neither will be officially compatible with Windows 10.

Both of them have ongoing bugs, but 2015 has a better chance of seeing them get fixed.

Resolution for Issue 'If i upgrade now, should I stick with pro 2014 or has pro 2015 been updated enough to get rid of any major bugs?' available: Yes (Solved).
Source: Intuit Community forum.

If i upgrade now, should I stick with pro 2014 or has pro 2015 been updated enough to get rid of any major bugs?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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