Ive been researching for altcoin that has a higher functionality in terms of faster transaction speed.
i just want to mention that having a faster transaction speed doesn't mean the coin has a higher functionality also. a lot of altcoins have reduced the time between the blocks so they have faster confirmation speed and things are fine as long as nobody is using their coin but as soon as the usage grows they all fail.
so you should also look for their performance under a heavy load not just under normal circumstances that nobody uses the coin and the number of transactions per day is pathetically low.