The reason people aren’t answering your question is because you are asking the wrong question.
Stability from width is really a function one cares about on flat water. On moving water, you have current shears at eddylines, waves, rocks, etc., which would make a boat which is super stable in flat water flip faster than a boat which people would not think of as stable.
The inflatable is rater for higher class rivers not so much because it would allow the paddler to handle them better, but because the boat itself would survive better going through a higher class river. The Pelican likely would break apart if it goes down a high class river.
White water, even easy class IIs, will flip people. Everyone. The way people in white water specific boats handle this is to learn to roll very early in their career, so a flip is just a matter of popping yourself back up. Not rolling means swimming to shore and then collecting gear from whereever it lands. Tiring.
I have a better suggestion. You didn’t really say where you plan to paddle. It is not uncommon for newer paddlers to look at specs of types of water to paddle and tick off everything, where the reality could be that 90%+ of their paddling is in one type of water. If you let us know the places you will primarily be paddling, we could give you some advice on which of these boats (if either) would be appropriate.
A couple of articles available online you may want to read, both from California Kayaker Magazine - South West's source for paddlesports information. Issue #10 has an article on basic classes of kayaks. Issue #9 has an article on kayaks and small living places, which talks about the difference between hard shells and inflatables (among others).