Re: Difference between '59B and JB bridge?
OK, so if I've got this right, the general opinion seems to be NOT to put a 59n in a 335 or an LP
59s are excellent pickups in both of those axes, and many others besides. They are a recreation of the 1959 paf recipe and are even wound on the original pickup winding machine from the gibson factory.
I know a guitar tech who once put the Jazz/JB combo in an Epi Dot 335, and he claims it was the best sounding guitar he'd ever heard
i reckon you can dismiss that guy's opinion as someone who is prone to hyperbole.
Anyways here is what i would recommend for you:
explorer: 59n, custom bridge. See how you like those together. If they need tuning in to find your own personal tone preference, swap magnets until you are perfectly satisfied.
335: a pair of 59s.....again swap magnets until you are happy - especially is rewiring 335s is a time consuming process (ive done it multiple times in my 335). Make sure that you do it right, and you will only need to do it once. Use high quality 500k pots from cts or bourns and nice caps too. Make sure the switch and jack and good quality too.
The reason for these recommendations is simple - both customs and 59s sound great with pretty much any magnet, so its just a matter of tweaking to taste - and in the case of your 335, swapping magnets is a lot easier than replacing pickups. So basically, you cant go wrong with these pickup selections. Both axes will sound killer...its just a choice of what kind of killer you like best.
JB? nah. not for either of your axes unless you want to shred and wail. They are very hot and very present with a real high end scream that cuts through with high gain for singing, legato leads and pinch harmonics. Thats all great stuff, but you will have difficulty getting smoother vintage tones and sweet singing clean tones. To answer your question about why seymour likes them....thats because they sound great in his tele/gib, which has very little in common with either an explorer or a 335. Its all horses for courses.
re: wlh's: i have a set in my 335, but i reckon they would sound awesome in just about anything.