Should I buy two S19j Pro's for $3,700 USD and mine it for the next few years or just buy $3,700 worth of bitcoin (0.16 BTC) ?

My worry is that mining difficulty will keep going up and I will run out of time being profitable before I reach 0.16 BTC.

At the current difficulty of mining, it will take over 250 days to mine 0.16 BTC with two S19j Pro's but the difficulty will be WAY higher in the next 250 days...