Hi rbrooks,
Dunlop will also tear fairly easily if you pull or tug at it but if you take reasonable care when you move it and don’t “grab” or pull at the latex I don’t think either one should be an issue.
The choice between Dunlop and Talalay is really a preference issue. There is more about how they compare in post #7 here.
My suggestion about the Talalay is mainly because it’s what he’s already used to so if you choose a Dunlop topper I would confirm that they also have Talalay available and will exchange the topper for another one just in case he prefers it. Your Ultimate Dreams also has a polyfoam quilting layer that would act to soften the feel of the latex slightly so it may also be worth considering an ILD that is one step softer (24 ILD) to “compensate” for the quilting layer to some degree. The materials and design of the bed underneath a topper will also affect how it feels so this is a variable that you won’t be able to predict until he actually sleeps on the combination but with a topper that is similar to your Ultimate Dreams it should be reasonably close.
Phoenix