[lovehamsters01]

I personally do one pellet diet and one seed mix just for variety, but some people feel differently.
I found that between my 4 hamsters, none of them ate enough of each and when I gave both, they were eating much more.
I think they liked the pellet food (I also used Science Selective) better for taste but the seed mix (I use Higgins Vita Garden because we don't have Harry Hamster here) offered more variety and was fun for them. using a mix also gives them a foraging experience and lets them feel like they're in the wild.
Aside from that, you'll also be supplementing their diet with fruits, veggies, and proteins such as Pure Bites freeze dried chicken, hard-boiled egg, crickets, mealworms, etc. plus a lot of people give their hamsters whimzees, millet/flax/wheat sprays, and just generally little things from their pantry (oats, raw rice, raw noodles, plain sugar free yogurt, etc.) so it's definitely more than just one food either way.
hope this helps!