I just got in the mail today a book that is the last in a series that I have been reading and I really want to read it, but I am torn.  I also have got a WL book in the mail and I feel kind of obligated to read that one quickly so I can pass it on.

How do I decide?   

The book in hand is the book to read.

I'd also go with the book that I wanted to read. 

Good thing for you they're the same thing!  :-)

I'd go with the book that is last in the series first. You've made it clear that's the one you want to read. Besides, it shouldn't take you too long to get through with that one so you can read the wishlist book, and you've already been reading the series anyway. Of course, that's just my opinion. As much as I feel for people waiting on wishlists, I really don't think you're the only one with that book, nor do I think waiting slightly longer will hurt them.

Well, I'm one of those delayed gratification types.  The LAST book in the series as in there will be no more?  Then I would probably wait to up the anticipation and prolong it not being over yet feeling. 

But, if it is merely the most recent in a series that I want to read more vs. wishlist book?  Read what you want.  The wishlist will still be there and people will be grateful when you do finish it, be it now or some time off in the future. - They are your books - take them in the order that will make you most happy without regard to PBS.

Read what you want to! I try to read several WL books a month just to keep the credits coming in for more WL books, but I usually just read what I want to!

I just read a book that's 3rd or 4th in a series (which I didn't know when I requested it) but I decided to read & repost. Used to be OC about reading books in order but I'm almost cured of that . Now if it's in my hands I'll read it; figure by the time I finally get the first books I'll have forgotten whatever I've already learned about the characters. Whew, you know what I mean.....

Read the book you want to read first most!

I used to make WL books the priority and it stressed me out. Made me not want to read them. Now I just read what I feel like reading unless I have a deadline for a game with a book I need to read for that. So if I feel like reading a non-WL book then I just look at it as it can go on my shelf where I can use it for a BOB or maybe it'll just get ordered.

The main reason I would have to read the book that is in the series is that you are  fresher with the details in your memory now.  If I wait I tend to lose more of the details of the series - so I like to keep reading them as close together as possible.  OTOH - if the other book looks more interesting - then read that!

Ruth