I've opted for a 3-prong approach, that varies according to the ratio between DEC and SPS
I have about 50% as staked SPS (which I am in the process of unstaking as vouchers will lose value over time)
I have about 40% in a DEC:SPS Liquidity Pool (many advantages- including that my SPS gets AD points)
The last 10% is split between SPS and DEC which I slosh back and forth as the ratio goes from 50:1 to 70:1 and back