first of all you can always upgrade your hashpower if the contract is available to buy
second yeah 20 hash can make you reinvest to get more hashpower and profit in the long term
also i'd recommend checking this site before investing in any one of those contracts
https://www.coinwarz.com/calculators
put the hardware costs with the cost of the hashpower then down it'll tell you how much profit per hour, day, week, month and year and also what's your ROI