Framebuffer objects performance

I have to draw to different textures and render buffers for every frame of my application. What is faster:

1 - Having one framebuffer object and regularly changing the attached texture.

OR

2 - Having multiple framebuffer objects, each one always being attached to the same texture and changing the DrawBuffer regularly.

?

s.

2. should be faster in theory, if you have the vram to hold everything, as it will allow better parallelism.
   But if you really want to be sure, benchmark both solutions.