I am planning start dnotes mining is it worth starting now because block rewards seems to be less
It all depends on your outlook. There aren't very many "good" coins to mine right now. By good I mean very profitable. Every coin is going to require at least a 5k investment in hardware to hit any real profit and that's just a very general number, it'll most likely take more. I don't know your situation but if you want DNotes buy 'em. Or both because they are about equal right now in costs, unless you count wear on your miner/s.
***WARNING, RANT***WARNING, RANT***
The crypto game is going through the bumpy part of it's evolution. Before it was mainstream it was relatively smooth sailing, isolated. Now that there's more exposure, more coverage, people are seeing every little dirty detail of how this is all playing out. The funny part is how the parallels are never being drawn between the instability of crypto and the instability of fiat. We can all see every fraction moving back and forth and for the most part the entire system is transparent. It sounds like double think when people use arguments against crypto that can easily be turned around against fiat. In fact there is one argument against fiat that can't be used against crypto, DEBT! For longer than I've been alive every US dollar has been created through the issuance of debt. And since US notes are the world reserve in turn every single fiat currency is backed by debt. Only a dramatic shift in the global economy will change this, because the Fed creates USD and LOANS it to the US, and this will never(subjective) stop. So what seems inevitable is USD will lose it's reserve status and it's buying power will severely diminish if not crumble. My point is with crypto an open block chain prevents all these shady dealings and foggy at best "numbers" from "Fed"/"Government"/"Officials" and would allow anyone with enough will to see for themselves the true situation of an economy. But for now we have a bunch of untrustworthy "officials" telling us one thing and a bunch of shady "experts" telling us another. So I guess we just have to hedge our bets an try and cover any and all our bases because crypto is only going though a bumpy ride. Just wait till the currencies tied to hard assets finish their bumpy ride and get that launch from the jump just before the cliff edge we're going towards. The only problem is the USD won't make the gap because it has been weighted down by the endless creation of dollars and their subsequent transfer to the elite of the world. To explain my metaphor, when an economy is faced with hardship ie bank failures, corporate failures etc, it should be allowed to fall as fast as it wants, as it fundamentally should. When it does it creates a vacuum of wealth be it new or old. Since there is always a need for goods and services this vacuum is always filled barring a few things like lets say asbestos but that could be generalized as insulation and fire retardant which has continued and thrived. So at the bottom of this rocky tumble down the hill and off the cliff is the jump which is made up of the people filling the vacuum. The economy/dollar hits the jump at its free fall speed and clears the canyon to live another day. But with all the manipulation a lot of weight and drag have been added and the gap does not look make able. So whenever some one blah blah blahs about crypto just let them know that their contradicting beliefs give you a headache trying to comprehend and that they would be better off putting the sunglasses back on and trying to look cool making someone else rich.