I have both, I think the snugglesafes are useful to have for winter or in case of poorly buns, they stay hot for a good length of time and the covers are easy to replace if they get dirty or whatever.
I have an ice pod too but the buns don't really use it, as it doesn't come with a cover I don't think my bunnies find it particularly nice but even under a blanket they don't seem to bother but it helps me feel better that ive tried to keep them cool!