1f56bc31_ox_vs_App___SharePoint_Dragons__Farm
[0] Resource throttling [Sandbox] Run under an advanced resource management system that allows resource point allocation and automatic shutdown for troublesome solutions. [Apps] Apps run isolated from a SharePoint farm, but can have an indirect impact by leveraging the client object model. [Farm] 
Can impact SharePoint server-farm stability directly.
SharePoint 2013: What to do? Farm solution vs Sandbox vs App | SharePoint Dragons
Farm