It depends on what are your preferences and what do you need. If you want to run VPS only for Cosmo Coin, it wont cost you that much...
Well, according to Cosmo coin specs, which are:
POW/POS: 35%
MN: 65%
Masternode Returns:
Month 1 = 1150% APR*
Month 2 = 850%
masternodes should bring more than staking. I would say that wherever you can stake 24/7, you can run a masternode 24/7 as well.
But if quantity of MN increased, the 65% will be divided to more number which will decrease the share .. and in this time the staking will be more rewarded, I think