[Koha] Barcodes, any ideas which ones?

Hi all, My question is not specific Koha, but I know people must have dealt with this. I am moving a library system for our church from an old msdos based system to Koha. I have the luxury of having almost no constraints, but when I came to barcodes I learned there were more versions of barcodes than I bargained for. Does anybody have any advise to give or ideas about which ones are better for libraries than others? I can assign my own barcodenumbers and borrowernumbers, so I do not have any constraints there. (Some of you people must be soooo jealous...) I am planning to use kbarcode to generate the barcodes Thanks all, Marty Jongepier