As Bjoern said above, P3D (like FSX and FS9) has a better weather rendering than XPlane11 for the moment.
However, for getting this nice weather rendition, you'll need an external, payware weather engine. Active Sky is for the moment the best choice.
Also be aware that P3Dv5 now also has real sloped runways, altough that's not automatic: the scenery creator has to use that feature. So older and default sceneries will still have flat runways.
P3Dv5 also features some new atmospheric effects with real 3D clouds, but that basically an early beta version for now. Quite limited for weather rendition (again, for now. Nobody knows where this is going...).
XP11, despite its limitations (weather sucks, ATC is worse than FSX/P3D, fewer addon planes), has some very strong points and I would strongly advise you to take a "serious" look to it.
You can download a demo.
Contrary to the FSX demo that was available many years ago, the XP11 demo is always updated with the actual engine of the complete sim... In fact, you DO download the complete sim, but the scenery is limited to the area around Seattle, and the flight time is limited to 10 or 20 minutes before you need to quite and restart the sim. It's more than enough to make experiments and study the "feeling" differences between the two sims
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