Hoping to elicit more feedback and response as I'm considering a polar
A series box
vs
Z series box n paper
If both have around the same condition and diff is 1k+ abit more
Which one would u go after
Thank you guys
how much is the Z series b+p you're looking at, and how "complete" and "period authentic" is the package?
other things being equal, imho, b+p - ALWAYS!

cos they'd ALWAYS command better prices and are readily snapped up.
A series if you're:
- (edited: A series has swapped to luminova lume). get pre-A if you're into more vintage tritium dial (but remember that it has a limited lifespan and will stop glowing; in return you get a nice, even cream patina when it ages - IF you're lucky)
- into lug holes case for that old skool vibes and ease of popping off the bracelet (if you're a strap *****)
- don't mind folded end links (where you get to enjoy the "rolex rattle").
Z series if you:
- are into the 3186 movement with parachrome hairspring (do note NOT all Z series have them. mine don't. but the 3185 has been around long enough to be a proven, reliable movement powering the explorer II and GMT master II for decades)
- hate lug holes
- love solid end links
or if you're like me who like BOTH lug holes case AND SELs - and prefer the practical functionality of superluminova lume, then ONLY the P, K or Y series will do.
as for condition, let me put it in perspective for you: sought after, beaten up vintage rolex sports model fetch higher prices with full provenance (ie. b+p). as an eg, just check out current market value of the 1655 explorer II.
a shiny, new 1655 with fresh hands, a fresh bezel, a new service dial, a new service crystal and polishing at rolex service centre WITHOUT b+p fetches MUCH LESS than an unpolished full set WITH b+p 1655 that's a little bit grimy, a little bit dirty, BUT untouched. being all original IS THE KEY.
unless yours is a safe queen (ie. you bought your polar exp II brand spanking new at the AD and threw it immediately into your safe with all stickers intact), it's unlikely to be in pristine condition when you actually get to wear & enjoy your watch.
when your polar explorer II reaches vintage status in 20 yrs time, it should age accordingly to reflect its status. being beaten up may even add to its charm and value. so when buying pre-owned, unless the watch looks like it's been obviously abused, with gritty winding crown action, the key condition is that the movement must remain buttery smooth in tip-top condition.