I actually had the second one you posted(with the ramps) for my hamsters(they were Syrians). I loved it. It gave them several stories to run, and plenty of air flow. I do not remember the bar spacing, but obviously it wasn't large enough for a hamster to squeeze through. I know I've read that for mice habitats, bar spacing needs to be small enough so that you can't get a single finger in between the bars.
I will give you a piece of advice: if you go for the second, or..either one, do NOT connect your wheel to the cage topper. I had a hamster in mine where I did that, and I found him dead in his nest a few days later, laying in his own blood. ..As near as I can figure, he got spinning on the wheel so fast(that's what he loved to do) that he literally threw himself out of it, smacked into the plastic box you see in the image, and did some internal damage. I can't figure out any other reason why he would have been laying in his own blood. If you're to get it, I advise you keep the wheel on the floor in the glass aquarium, or remove the plastic box and figure out something much softer that the ramp could lean against, and something that wouldn't potentially hurt your little mice.
You see where the second level is? Where's there's just one "floor" instead of two? That's where I fastened the wheel. There was barely enough room for my hamster to shimmy past the wheel and still stay on the level, but they still managed to do it.
That said, I still LOVE that cage option for hamsters. but I will never, ever again, fasten the wheel to the bars. Ever.
For mice, though? I'd wager the one with tubes might be a better option.