I know it's the boring answer, but it's a personal choice.
If your collecting a set, both will hold roughly the same value. In that case, Id chase the best looking set, which is prestige (in my opinion)
In terms of being told you have 'a better chance' to pull more valuable stuff from Donruss, Im guessing they are referring to Donruss yeilding more jersey/auto hits per box.
This does not mean you have a higher chance of getting a big hit. It just means Panini stuffed the product with more junk 'hits' than prestige. A prestige gold /10 or green /5 or black 1/1 will always be as valuable as the Donruss equivalent.
A safe estimate is that only 1-2 boxes per case will hold a card worth more than the box price. This will be the same for Donruss or Prestige. So go for what looks best to you.
If your joining the hobby to get rich quick, go buy scratchies instead. We all dream of the big hit, and some have been lucky to live it, but know going in that it is highly unlikely. Then whatever you hit will make you happy
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