It consumes less electricity.
Miners or delegates or validators or whatever will expend
resources only to the extent justified by transaction processing profit margin, which delegates in DPoS will also do. In fact DPoS may well have high profit margins because the number of delegates is fixed, making it a closed market.
So perhaps less electricity, but if so then more resources expended on something else (politics most likely).
(This assumes that the coin distribution phase of Bitcoin is over or insignificant, which must be done to meaningfully compare with DPoS since DPoS is incapable of distributing coins at all.)
, a very high incentive exists to centralize mining, because transactions fees are a Tragedy of the Commons. We keep coming back to the research I did in 2013. I had already figured all this stuff out back then.
I had even pointed out the block size issue back in 2013, which is now the raging problem today with BitcoinXT alias GavinCoin.