ASP.Net 4.0 web farm caching

In ASP.Net 4.0 which is the best way of storing the cache object when we go with webfarm ,

1) Windows Server AppFabric

2) Separate State Machine / SQL Server

3) Thrid party caching mechanism开发者_运维问答s / Others ?.

---

I would say sticking with MS technologies would be the best since you're already using ASP.NET. AppFabric was designed just for this case. Otherwise Memcached is a good alternative.