It’s a fierce battle. MonsterUp has been in the Marketplace for Windows Phone since January 2011, while MonsterUp Adventures has been there for 6 days. But it seems like the battle is going to be to the end.
On the red corner, the veteran, MonsterUp with 450 reviews and an average of 4.41/5 and the following rankings:

#1 in Greece +4 places compared to MU
#4 in the UK +1 places compared to MU
#8 in the US -2 places compared to MU
#14 in Germany -10 places compared to MU
#14 in Spain -11 places compared to MU
#15 in France -12 places compared to MU
#3 in Hong Kong +6 places compared to MU
#3 in Singapore +1 places compared to MU
#7 in Denmark -2 places compared to MU
#8 in Belgium -3 places compared to MU
#20 in Switzerland (FR) -16 places compared to MU
#5 in Mexico +1 places compared to MU
#6 in Canada (EN) -3 places compared to MU

On the blue corner, the challenger, MonsterUp Adventures with 24 reviews and an average of 4.91/5 and the following rankings:
#5 in Greece
#5 in the UK
#6 in the US
#4 in Germany
#3 in Spain
#6 in France
#9 in Hong Kong
#4 in Singapore
#5 in Denmark
#5 in Belgium
#4 in Switzerland (FR)
#6 in Mexico
#3 in Canada (EN)

Well, who is the winner? Who cares! The Trelloland cute monsters win!