The more experience you get, the more your realize bankroll management is key.
A large chunk of people spend their whole "gambling career" without realizing how important keeping a continuous eye on the bankroll is. Good on you for having realized it already
Why would it make a difference table or wheel? They are both reflections of each other. Most tables also have the oval eith orphelins and neighbor bets so the table is the better option. Or do you mean a system based on wheel or table?
Some of us though don't need experience to realize that the bankroll is what it's all about, but experience will help you be able to multitask the strategy and the bankroll at the same time.