Your last sentence is also problematic, assuming you define "best" the same way I do.
How about a thought experiment?
You and I agree to go to the casino with $900 cash each plus ten $10 PTYL promo chips each.
We agree to play 2 hours of blackjack, and 2 hours of craps.
We will play identically...
Betting $10 on each hand of blackjack and using perfect basic strategy.
At craps we will make a $10 pass line bet with no odds, and no other bets.
The only difference is where we play the promo chips.
You play yours on blackjack, and I will play mine on craps.
Who will end up with more money (on average)?
The answer: Neither. It's a tie. We will both have exactly the same expected profit at the end of the day.
What is that expected profit?
Well, let's put some possible numbers on it... 2 hours of blackjack is around 120 hands. At $10 per bet, that's $1200 in original bets.
We'll assume a good game, and a house edge of only 0.25%. So, our expected total loss at blackjack is $1200 X 0.25% = $3.00 each.
Craps is more expensive with a house edge of 1.41%. Let's assume we get the same 120 decisions on the pass line bet in our 2 hours at the craps table.
So, $1200 in action times the house edge of 1.41%... Craps costs us $16.92 each.
We started with $1000 (chips plus cash), and we have lost $19.92. We each leave with an average of $980.08 in cash.
So, I guess you can say that we converted our $100 in promo chips into $80.08.
And it didn't matter which game we played them on.
Everything I just stated is accurate.
Why is this so different than what you seem to be saying? Because you care what happens on the actual hands where you have the promo chips in play, and I don't.
They both lead to the same end result. Yes, you'll convert the chips better on the blackjack hands than I will at craps, but you'll be losing cash at craps while I'm converting my promo chips.
At the end of the day, it doesn't matter. Your loss is just your action times the house edge, over ALL the games you played.
This is why this discussion has no meaning. If you're going to play the games anyway, quit worrying about the chips and just play them.