TJF,
I'm assuming that you are relatively new to flying, because you'd probably have made up your mind already about which one you prefer if you weren't.
If that assumption is correct, then you may not actually need a flight guide. There is a large selection of airports with AIP entries, available for free from the AIS site. If these are the places you are going to go this year, then there is little need for a flight guide; simply print off the AIP entries.
The only extra details you really get from a flight guide are landing fees (frequently wrong or incomplete) and sometimes phone numbers for taxis/hotels. Bottlang has neither which I find really annoying.
While they are not expensive, ask yourself if you really need one? You may not.
dp