Clear winner for me means that I, personally, strongly prefer that watch to other two. I am not saying this DB is better than other two, I just like it much more. BTW, I am biased as I proudly own a similar DB.
Now, IMHO and only IMHO.
RO
Among all iterations of ROs I like only the 39mm extra thin with AP at 6, dark dial and date window, without second hand. That one would be a strong competitor here. There is smth esthetically for me in that size/thickness/colour combination that other iterations miss.
PP 5131P
I don't like PP worldtimers much in any iteration. Yes I know the model is classics but not for me. This one is not different, despite the beauty of enamel and the heft of platinum. Key reasons are:
1 a huge part of a dial space is devoted to (or spent on) a list of cities, leaving only very limited space to a center part of the dial.
2 the central part in itself is beautiful, due to cloisonne enamel, but I find it too small vs the dial width
3 hands are way too short to be attractive and for me hands are important. Yes, they are like that intentionally, because of cities, but we go back to point 1
4 I don't like when on the dial the very center is dark while outer part is white/silver/in much ligher color. My brain wants to think the dial is too small because of that. I strongly prefer the opposite combination or the absence of it.
DB 25 power reserve
For starters - I own 4 DBs, including the identical one...
I believe it gives a very special old school feeling, a bit like a pocket watch on a wrist.
The width is 44mm, which is big and looks big on pics but, due to smart hollow lugs, it wears well on my 17.5cm wrist. A similar model also existed in 40mm back in a day, but each size had pros and cons without a clear winner. I guess 42mm would be ideal...
The dial has beautiful classy guilloche. Lines are long and pleasure to look at.
The hands are modern art in both shape and color.
Numerals and minute marks are very organic in font/color/size.
The crown is interesting and cool.
The back is a pleasure to look at. The movement is advanced, solid and modern, in an interesting interplay with classy dial.
I am clearly biased, I love it and can continue on and on... Please - no offense intended.
Better pics of a similar DB are here (in rose gold though).
www.watchprosite.com