So to understand correctly, you want to obtain the most coins you can per hour.
Hash rate isn't determined by which alt coin you choose to mine. If your hash rate is dramatically different depending on which alt coin you mine you may have some problems with you settings on your miners assuming you arn't jumping between a CPU and GPU coin.
When developers make coins they choose the amount of blocks and the block reward.
However I think you are looking at it the wrong way. DOGE has a total of 100 billion coins to be mined. Where as Earthcoin have a total of 13.5 billion coins and each have a different block reward algorithm.
If your goal is to obtain the most number of coins then DOGE will net you more coins per hour.
I think you should be looking at obtaining the most valuable coin per hour rather than the most amount of coins.
This however is even harder to predict. a good starting point is
http://http://www.coinchoose.com/ this site will show you the most profitable coin at the given time.