I agree with Cathouse Willy, cold smoking is something you don't think you need until you can't do it.
Many users are using the digital without an upgrade, and are satisfied with it. You are dealing with 500w element plus 125w bisquette burner, so it takes longer to cook your food.
The P10 has two 400w elements, plus another 200w when the generator is turned on. Since you are not interested in cold smoking the P10 will work for you, but I've even found it difficult to hot smoke with the P10 (38°C - 83°F). This makes it difficult to smoke sausage, and/or bacon. If your main interest is to smoke/cook foods at barbecue temperatures the P10 would be a better choice of the two different models. You could probably cold smoke in the P10 if you use a smoking device such as the A-MAZE-N pellet-smoker, though I'm not satisfied with the smoke flavor these pellets produce.