This took me like 30 minutes to do fam so you better enjoy dis, I calculated the EXP per coin for each mob. Here are my results:
Zombie=1 EXP Per 2 Coins
Spider=1 EXP Per 2 Coins
Cave Spider= 1 EXP Per 2.6~ Coins
Creeper=1 EXP Per 7.5 Coins
Pig Zombie=1 EXP Per 5.3~ Coins
Skeleton=1 EXP Per 10 Coins
Silverfish=1 EXP Per 10 Coins
Endermite=1 EXP Per 11.6~ Coins
Blaze=1 EXP Per 11.42 Coins
Slime=1 EXP Per 12.5 Coins
Magma Slime=1 EXP Per 15 Coins
Giant=1 EXP Per 30 Coins
Armed with this knowledge go play some Tower Defence!
Zombie=1 EXP Per 2 Coins
Spider=1 EXP Per 2 Coins
Cave Spider= 1 EXP Per 2.6~ Coins
Creeper=1 EXP Per 7.5 Coins
Pig Zombie=1 EXP Per 5.3~ Coins
Skeleton=1 EXP Per 10 Coins
Silverfish=1 EXP Per 10 Coins
Endermite=1 EXP Per 11.6~ Coins
Blaze=1 EXP Per 11.42 Coins
Slime=1 EXP Per 12.5 Coins
Magma Slime=1 EXP Per 15 Coins
Giant=1 EXP Per 30 Coins
Armed with this knowledge go play some Tower Defence!