In the old days, Fool Service Brokers charged a variable fee for equity and option trades. I think most have gotten away from that and lean more toward fixed fees and managed fee accounts.
On the discount broker side, option commissions are charged as a fixed fee. Some brokers charge a base rate plus a fee per contract (for example, $4.95 + $0.50 per contract). Another charges a simple flat fee per contract (25, 50, or 70 cents per contract with free assignment and exercise). And another charges $1.00 per contract to open with a maximum charge of $10 per leg and no commission to close.
If you are dealing at a deep discount broker (less than a dollar per contract), commissions should have almost zero involvement in your option decisions. Decisions should be based on your outlook for the underlying as well as your money management criteria.
I would suggest that you ask Robinhood what their routing procedure is for option orders. A good brokerage firm offers Smart Routing to the option exchange with the best prices. If RH is routing to a specific exchange, you may indirectly be paying for no commission trades with poorer trade fills.