Well, one of them in $3.99, one is $9.99 (USD), so we could go that way.
But seriously,
Catlady, I think it's up to you to break the tie. Both have good reviews on Goodreads (3.94 v. 3.99 -- statistically irrelevant), both are short. One has a huge wait at both of my libraries, but if it wins, I'll deal with it. So toss a coin, or research them, or whatever random selection mechanism works best for you.
