K2 Workflow VS Visual Studio Workflow

Category	K2 Workflow	SP Workflow
Monitoring	You can find ‘Flow Diagram’ for the current status in graphical mode. You can also do real time monitoring of each task.	No Real time monitoring for each task.
Code	Simple No code solution. Business user can also use it.	Developer need to code. Business user cannot code it.
Scope	It can live also on non sharepoint platform like SAP, CRM etc.	It live only on SharePoint.
Error handling	K2 introduces a ‘BlackPearl Workspace’ site which  manages all for Error handing of each instance, managing workflow permission and tracking workflow process etc.	We need to write custom code for Error handling.
Browser	K2 support browser based workflow	No browser support for designing custom workflow. Yes, SharePoint do have OOTB browser support workflow but can't satisfy all variety of requirment
Cost	K2 product is very expensive. Need their own dedicated server for running their processes	SharePoint too is very costly, but SharePoint provides couple of other feature too apart from workflow like webparts, web application etc.
Enterprise wide tool	Tool for SharePoint as well as enterprise wide need.	Tool for SharePoint applications. It need other tool to satisfy enterprise need. Like InfoPath for fultilling form ability. Exel charts to fultill reports need etc.
	K2 has their own logging mechanism which log data in DB for infinite nos. of days.
Delivery cycle	Speed up development and delivery cycle.	Since, developer has to code it, it may take time for huge change in requirment.