Unfortunately you can only find out the difficulty of a coin after you have downloaded the wallet and spent a few days syncing it. As far as I know there isn't a website that lists difficulty of PoS coins the way they do for PoW coins.
Closest is
https://chainz.cryptoid.info/ Difficulty is listed.
But since PoS coin has different specs, viewing the difficulty does not really help determine the best amount of coins per block, only the people staking know that info.
Also some are hybrid PoW & PoS so the PoW difficulty will be shown if the last block found was PoW.
Many people believe that combining PoW & PoS makes a coin safer, it does not.
It gives two points of entry to guard instead of one.
Strong PoS but weak PoW , vulnerable coin.
Strong PoW but weak PoS , vulnerable coin.
The reason:
ZEIT & Mint dropped PoW was a security vulnerability discovered by Rat4 of Blackcoin.
Considering the fact that the Chinese currently control the Majority of the World's ASICS,
and the mining pools in China alone account for over 60% of BTC,
I would say PoW difficulty is irrelevant at this point as the battle for PoW security has already been lost.
The only real question for BTC & LTC & Doge holders, is how much trust do you have in the Chinese Government to protect your investments.
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