Vertical cnc or skipper

We are going to be increasing our capacity in our component company next year and I am looking for a little advice. We are thinking about using our loader/unloader cnc for cutting part outlines only and doing the secondary machining on either a vertical cnc or a skipper machines. Here are my questions about both machines.

VERTICAL MACHINE:
1.Is the depth accuracy of these machines right on? We are not just drilling holes but have a joint that has to be right on the money depth wise.
2. Do they run parts quickly or will it just be the new bottleneck since you are only running one at a time?
3. Any other pros or cons on these would be great to know

SKIPPER
I like the idea of the skipper because it can process 2 parts at a time.
1. Is it hard to control depth since you are stacking 2 panels?
2. How does the post work from cabinet vision?
3. Any other pros and cons would be great

It seems the trend is vertical cnc machines for what I am talking about I am just having a hard time seeing the efficiency but there again I have never ran one. Thanks in advance for input.