Morphs are no different than any other ball python as far as temperament. A captive bred ball may be far more calm than a wild caught option and but any snake can be any temperament regardless of genetic manipulation..
Morphs can tend to be quite costly if it is a new designer morph but you can get plenty of nice looking balls for a reasonable price. No reason to spend $1000 on a "banana turbo creamsicle power slide het ninja turtle"* when you can get a beautiful piebald for $250 or even a sweet normal for $40
Most morphs brown out or darken over time but some do stay light. A decent breeder should be able to tell you which will stay light and which will darken up. Lesser genes for example often stay light. This is a great morph trait to look for if you want a lighter snake. Fire traits are another nice one and of course blue eyed leucistic are a very striking gene combo and can be all white but you often pay quite a bit for them.
The best thing to look for is decent weight (if they look skinny or sunken that should be a big flag). Temperamental snakes as juveniles are pretty irrelevant. A nippy baby can become a mellow adult. Also, don't forget the cost of habitat and husbandry equipment. I would recommend sinking money into a decent PVC enclosure over blowing it all on a fancy colored rare morph.
* I made that morph up
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