FWIW, I own a Katana 10.4 and have used it on solo, self-support river trips up to nine days.
When shopping for a cross-over boat, I looked at the specs and realized that the volume of a 9 foot crossover boat was basically the same volume as for a medium sized creeker. So why buy a 9 foot crossover boat instead of a creeker? The creeker can hold just as much food/gear, but it will be easier to control in difficult, technical water AND you can use as a day boat, too, while learning to run harder water. However, if all you want the boat for is short 2 or 3 day trips on easier rivers (Class III or less) with long stretches of flatwater, then a 9 foot crossover with a skeg would be a better choice.
The 10 foot crossover boats all have around 100 gallons of volume, which makes them a good choice for longer multi-day trips. However, it's a lot of work to control a 10 foot crossover boat in Class IV technical water, so a creeker still might be a better choice on shorter, harder multi-day trips, such as the Illinois. Either boat would work, no doubt.
Having a hatch is really just a matter of convenience when it comes to accessing your food/gear. But since none of the hatches are truly waterproof, you still have to make sure the stuff you're carrying is protected if it gets wet.