Do you finish (a series) as you start?

I happened upon a dilemma recently: 

If I start a series in one form, can I satisfactorily complete it in another? 

Let me explain. 

Say there is a series I started in paperback. Then the ebook for #2 goes on sale. Do I break format to read the book? Or do I wait and finish the whole series in paperback? 

I know this might sound a little crazy to some of you, but I’ve run into some serious issues here!

For example, I started a series as ebook. Got book #2 on Audible. But I hated it! Not the book, just listening to it. (It was a mostly epistolary novel and I discovered I don’t like listening to type of story. For me, the “letters” (or emails or texts, etc) need to be experienced on the page. Recently, with that same series, I found a good deal on the paperback of book #3. Ack! What’s a reader to do? 

Or perhaps there’s the flip side. I’ve read a book one, and then hear that the audiobook is fabulous. Will switching formats midstream in a series muddle my “feeling” of the series? 

Of course, sometimes things work out. 

Late last year I listened to a book one in which I loved both the story and the narrator! But then I fell into the conundrum about books two and three. My husband and I share an Audible account, so we take turns with the monthly credit (although, truth be told, he uses most of them!). And I couldn’t find either book in audio in my library apps. 

I was about to break down and get book two as an ebook, but then I got an email from Audible telling me that all my wish list titles were on sale! I didn’t get too excited at first. I’ve seen those emails before only to discover the book is discounted to $11 but I can get it for less than that in paper or ebook. But I clicked over just to be sure. 

Lo, and behold, the books two & three I wanted were both on sale—under $5 each! Now I can finish Pepper Basham’s wonderful Freddie and Grace Mysteries series all in the same format. Which makes me happy. 

And then sometimes, like with Gabrielle Meyer’s Timeless series, I start in paperback and know from then on I will read that format simply because I wanted the whole series on my shelf! 

Of course, there are many series I’ve started in paper and finished as ebooks—and vice versa—and enjoyed the whole thing. But there is a part of me that likes to experience a series of stories in the same format. 

What about you? Does format matter in a series or do you switch seamlessly in series reading from ebook to paper to audio? Inquiring minds want to know!