162641

It is a better choice to go with the coins.
This is because the probability of getting a heads on a coin is a half. So the probability of getting 2 heads in 1/4 and the probability of getting tails is 1/4 as well so the chance of getting what you want is 1/8. This will get you 3 points in every 8 spins.
The probability of getting a 6 is 1 in 6. The probability of getting 3 sixes is 1/216.
However the reward is higher as you can get a maximum of 6 points a spin. The probability of getting 2 sixes is 1/36. However you get 4 points.
If you run the model 5 times, at least 3 out of 5 times you would get more points from the coins because the chance of getting 2 heads and 2 tails is higher then getting 2 sixes. Even though getting 2 sixes would give you more points, the likelyhood of that happening is 1/36. This is 4 times lower then getting 2 heads and 2 tails. Plus the amount of results are higher if you have the spinners the the coins.
Therefore you should go with the coins.