There is no consensus, it's whatever you prefer the sound of (including the 2 different cabs together, which if you love them, there may not be any reason to change).
There are advantages and disadvantages to all 3 setups.
Let's look at a few...
Frequency response:
The 4x10 goes up to 5k whereas the 15 goes up to 2.5k. Both go down to 30Hz according to the specs. So the advantage goes to the 4x10 there (unless you like a more "vintage" sound without extended high end).
Sensitivity:
Both rated the same at 98db @1w 1m
Power handling:
15: 200w, 4x10: 400w. My instinct is that the 15 may be more conservatively rated than the 4x10, meaning with 2 15s you'd get pretty close to 400 "actual" watts. I have a feeling that even though the 2 4x10s would be rated for 800w, you'd be more likely to hit the mechanical limits of the speakers (maybe closer to 400w).
Size/Weight:
Both cabs are exactly the same size, but the 15 is 63lbs and the 410 is 88. So that's an extra 50lbs to cart around if you go with 2 410s, almost like having a whole other cab.
Price:
Looks like the 15 is about $100 cheaper than the 410. Meaning if you went with 2 15s, you'd be up about $100-200 in funds over the 4x10 ($100 for the lower cost of the unit itself, and the somewhere between $0-100 or so for the resale of a 4x10 over a 15).
So my suggestion would be to live with each cab independently for a while and get used to the sound each one makes, because with 2 of the same cab, that's basically what you'll get, only a bit louder. Put whichever cab you are using on top of the stack, to more accurately represent what you'll hear when you have 2 of the same. Then after you've tried both ways, go back to the mixed setup and see how you like that. That will allow you to make the most informed decision.
There are advantages and disadvantages to all 3 setups.
Let's look at a few...
Frequency response:
The 4x10 goes up to 5k whereas the 15 goes up to 2.5k. Both go down to 30Hz according to the specs. So the advantage goes to the 4x10 there (unless you like a more "vintage" sound without extended high end).
Sensitivity:
Both rated the same at 98db @1w 1m
Power handling:
15: 200w, 4x10: 400w. My instinct is that the 15 may be more conservatively rated than the 4x10, meaning with 2 15s you'd get pretty close to 400 "actual" watts. I have a feeling that even though the 2 4x10s would be rated for 800w, you'd be more likely to hit the mechanical limits of the speakers (maybe closer to 400w).
Size/Weight:
Both cabs are exactly the same size, but the 15 is 63lbs and the 410 is 88. So that's an extra 50lbs to cart around if you go with 2 410s, almost like having a whole other cab.
Price:
Looks like the 15 is about $100 cheaper than the 410. Meaning if you went with 2 15s, you'd be up about $100-200 in funds over the 4x10 ($100 for the lower cost of the unit itself, and the somewhere between $0-100 or so for the resale of a 4x10 over a 15).
So my suggestion would be to live with each cab independently for a while and get used to the sound each one makes, because with 2 of the same cab, that's basically what you'll get, only a bit louder. Put whichever cab you are using on top of the stack, to more accurately represent what you'll hear when you have 2 of the same. Then after you've tried both ways, go back to the mixed setup and see how you like that. That will allow you to make the most informed decision.