If there are 21 million scheduled Bitcoins and 84 million scheduled Litecoins does that theoretically make Litecoin worth 1/4 of a Bitcoin? I know that Cryptocurrencies are all subjectively valued, but I feel like Litecoin possesses qualities that could make it the preferred coin for everyday transactions. At this rate, is it a wiser decision to hold Litecoin instead of Bitcoin, assuming that Litecoin has at least ~21% growing potential?

Coinbase.com is my favorite. Signed up and linked my bank account and within minutes I was able to buy some coins. If you need them immediately you can also verify your identity via SSN and link a Visa credit/debit card in order to "Instant Buy" your coins and get them in minutes. Of course you have to live in the United States to use those features.

If the worldwide hashrate remained a constant would the difficulty increase due to the nature of the expanding block chain history?