In my view Pooley's and AFE's flight guides have much the same information but the styles are slightly different. I have used both but prefer AFE because I am more familiar with it, not because of any fundamental difference. Others may disagree. I buy the spiral-bound versions and they start to fall apart by mid-summer. By Christmas they've had it.
Bottlang is only available lose leaf, and that is how I tend to use it, just taking the required and expected plates with me. The folder is quite bulky, but at least its only one volume unlike the Aerads. For some stange reason, the Jeppesen Bottlang VFR pages are the same size as the Aerad IFR pages and not the same size as the Jeppesen IFR pages! However, the holes are punched differently (of course) as are the holes in the lose leaf versions of AFE and Pooleys.
Bottlang is the only one of the three to include Ireland and I found it quite useful for a recent trip. Bottlang has (mostly) a single lose leaf sheet for each aerodrome, with an airfield diagram and info on one side and a coloured map of the surrounding area (very good indeed) on the other side.
Suggest you buy a different one each year as really, personal choice will probably outweigh any differences.