Wow! Tough question!! I had to pause and think for a second about my response. I love the theme of Splash and the music. But, I also love the theme of the other two. In the end, I chose Space for these reasons: (1) when I see that ride as we pull up to MK on the first day of our trip, that's when it hits me that we are actually in WDW, so that put's it above the other two; (2) Remembering back to how I treated FPs for these three rides, I walked fast to get to the ride cars on Splash and BTMR, but I recall having to refrain myself from breaking into a full out sprint to get to the ride car in Space; and (3) Although I love them all, I know I get more antsy when I step into the space ride vehicle than I do getting in the Splash boat or the BTMR car and I know I feel more exhilarated when I step off Space than I do the other 2.