vCenter Server 6 and vSphere client

I am new to VMWare. I was told that vCenter Server is the newest and best and that vSphere Client is a thing of the past. I must have vCenter server. I installed it. The machine has 16GB memory. 200GB HD. 4 CPU's running Server 2012 R2. I added one VM through the vCenter Web Client. It worked for a little while then became sluggish. To the point I can't get into the web client anymore. I googled for days and tried everything I could find to fix a slow vcenter server. I figured I did something wrong. I uninstalled vCenter and wiped out the server. Reinstalled 2012 R2 and vCenter. Same thing. Worked for a few hours then died. I hate it!!

Now for my question. Can I still use the much simpler and more stable vSphere client to create and edit VM's even though they are still on vCenter Server? I realize there are bells and whistles on the vCenter but we are a small shop with not much need for those.

Thanks