IMHO block rates are not the most important factor to be worrying about in calculating true profitability. Not saying it is irrelevant, but for me it is not the biggest issue. Right now for me coinwarz is the best site, but ALL the mining info sites are still lacking one thing I would like to see...
As a miner I find that profit factor "right now" in such a volatile market is pretty much useless. What's the point of mining whatevercoin at 150% profitability if that 150% is going to drop to 40% in less than 12 hours? Not to mention the price went down 80% from where it was 12 hours ago and now I'm lucky to even sell the coins at all. This makes the "150% profit factor" a complete sham. The reason Coinwarz is superior is the fact that it provides an indication of how much the difficulty and price fluctuate. This at least helps a miner make a more intelligent decision about what to mine...because if I see a coin at the top of the list with 150% profit factor but a wildly fluctuating difficulty and price, I stay away. This is why I mainly stick to mining Novacoin...even before I discovered Coinwarz (just a few days ago)...because the difficulty and price seem to stay more stable. Without any real numbers on LONG TERM AVERAGE profitability, I am just guessing...so NVC is the safest bet, other than BTC or LTC of course.
What would make coinchoose #1 imho? Having an AVERAGE PROFITABILITY stat...say for the last 14 days or 30 days or whatever. Coinwarz shows averages for difficulty and price, but it still involves a fair bit of guesswork to find the most stable profit...or at least which of the newer coins has a better average than the others. I know, I know, the chart on coinchoose shows historical data...but first, it is not an average (though it could be used in a similar fashion to the coinwarz averages, if you could read it)...second, you can't read it. There are so many lines on the chart it is illegible. Third, it is only 24 hours...which is useless. Even if you took the existing chart format and used a longer time period and maybe split all the coins into individual charts or 4 or 5 coins per chart (so you could read the damn thing), would be very useful. But I think even better would be to have some way of ranking by average profit factor over a longer time period. Then the user can choose whether to mine for "Ms Right" or "Ms Right Now"...or "Ms Right Now Adjusted".