Assuming they don't change their practices, it's always better to use a different broker. Robinhood was the first to eliminate comissions, but now most brokerages have also eliminated comissions, so say thanks to Robinhood and then use an established broker.

I would expect market and limit orders to have been handled similarly. Market makers would like to trade with retail investors, and they're willing to pay X for that; if Robinhood takes 80% of X, and passes on 20% to clients as price improvement, and other brokerages pass on 80%, your limit orders may execute sooner at other brokerages (as your limit is effectively 0.6X higher/lower), or may end up executing with bigger price improvement.

Use Interactive Brokers Pro, then you can put in market orders and know you'll get the best fair price.

From other posts in the thread, I understand IB Pro forgoes payment for order flow, but does that also mean you're forgoing price improvement?