Hi Fran,
Both Talalay and Dunlop come in a range of firmness/softness levels. Firm Dunlop would be firmer than softer Talalay and Firm Talalay would be firmer than softer Dunlop. In the same ILD (firmness level) then Dunlop would feel a little firmer for most people because it is a denser form of latex and gets firmer faster as you sink into it.
They have a different “feel” and the choice between them would be a personal preference not a “better or worse” choice. You can read a little more about the difference in “feel” between them in post #7 here.
Both Talalay and Dunlop are very durable materials and roughly equivalent so I wouldn’t make durability an issue in your choice between them.
Phoenix