Oh, lol. They are both 3D as far as I can tell. I get it though. You meant the test mode F9 editor? OK, sorry. I rarely use that editor except for fine tuning some sculpting. I've found it really frustrating to work with. Yeah, I don't know what you can do in that mode since I don't really use it.
System Specs: OS - Windows 7 Home Premium 64-bit SP1, CPU - AMD Phenom II X4 945, 3.0Ghz, RAM - 8Gb DDR3, GFX Card - 2048MB NVIDIA GeForce GT 640, FPSC-R Version - Beta 1.0071