The Technically mining process initialy speaking GPU mining is better for profits than HDD mining. However, my thinking is that means getting in at the ground level in HDD mining where GPU mining is crowded. HDD's are always valuable regardless of the crypto market.Assuming you are doing this as an investment I think at the moment it's too soon to get a sensible system. Your electricity costs and potential fees for the static process will probably out spend rewards. Statiprocess can be obtained for free with good admin if you keep on top of the account. If that started should be relevent on HDD mining.