Amount of money that you will make counting cards depend on several thinks.
1. System you use to count cards
2. Bankroll
3. Bet Spread
4. Number of decks
5. Specific rules for the game you play
6. And also Penetration
Using multilevel count system is better than Hi-Lo, you will make more money over the long run, but how much more.......
If your bankroll is $2 000
and you play 4 deck games (S17, and DAS) with good penetration, and you spread your bets 1-8, using Hi-Lo you will make about $6.54 per hour. Amount of money that you make in one hour also depends on number of hands dealt.
But if you use Hi-opt II and all other conditions are the same you will make about $7.29 per hour.
So using multilevel system will make you 75 cents more per hour. Not a lot of money.
But if your bankroll is $15 000 than usinh Hi-LO you will make $46/hour
Uisng Hi-opt II $60/hour, $14 more than when using Hi-lo. I wouldn't throw away these $14.
The more edge you get the better. If you are going to be solo card counter, I would recommend you multilevel system. It is harder, but only if you work hard you will make money. Laziness does not pay off.
It is the best if you can master Hi-LO, Hi-opt II, Uston APC. The more the better.
Good Luck!