eth imo looks hot now for mining.
not anymore, there are better alternative, even spreadcoin is slightly more profitable
diff is still increasing on average
where do you calculate what coins has the most profit?
You can try http://www.coinwarz.com/cryptocurrency or https://www.whattomine.com/
.Coinwarz is great for current profit but it does not change difficulty like one needs on some currency. Over time this will lead to HUGE differences just by not having a difficulty change.
If bitcoin I suggest bitwisdom - https://bitcoinwisdom.com/bitcoin/calculator . They also have a litecoin calculator aswell. But it's very good with difficulty changes which leads to long term better speculation.