Do Jazz and Prowl have weak points and strong points to parenting?
Of course! Let’s think of them discovering their strengths and weaknesses when raising Rubble. He was the guinea pig baby after all. 
I’ll start with weakness-
Prowl doesn’t talk to his sparkling, he tries to teach them words sure, but he doesn’t ask them questions or tell them stories. Prowls thoughts are they don’t understand him so what’s the point. while Jazz will have full blown conversations with them. Jazz informed Prowler that it’s actually very healthy for a Sparklings development, so Prowl tries his best. Even if he’s a little awkward about it.
Prowl is a hardass. He’s incredibly strict. If he wants something done right they’ll sit there till it’s finished. Rubble doesn’t finish his food? Well they’re gonna sit there till he does. Not cleaning up the way he wants it done? Well they’re gonna sit there and fix it even if it takes two hours. This is generally a good skill but Prowl has a tendency to take it too far.
Jazz is not very good at disciplining. He left all of it up to Prowl. Not very cool of him. He just starts feeling bad when Rubble started getting upset. Especially doing certain chores that would really make rubble mad, like baths and bed time, he’d just leave that to Prowl.
Jazz used to believe that sparklings belong more to the carrier than the sire. That can lead to all kinds of mishaps. It’s a toxic belief that he carried from his idiot parents.
Jazz gets easily overwhelmed with a crying and screaming sparkling. He gets frustrated if he can’t figure out what’s the matter. Normally he’ll walk away and come back to the sparklings when he’s feeling less negative. Of course prowl has probably already calmed the sparkling by that time.
Prowl is seemingly immune to screaming and crying. It just… doesn’t bother him. He handles very situation calm and orderly. Sometimes the sparkling cries for no reason, and sometimes they’re crying for a very good reason. Prowl treats it both with the same calculated effort to get the best possible result. Especially in an emergency. He’s able to keep both the sparkling and jazz calm.
Prowl is incredible protective. He’s powerful and intimidating to others and the sparkling can feel that through his field. And in a would have big scary metal, and often short tempered cybertronians, it helps to have such a powerful carrier. Prowl allows no one to just touch his sparklings and just don’t hand them over to anyone. It builds the sparklings confidence, knowing they’re always safe and secure.
Jazz is incredibly loving and calm. He’s a source of calm comfort for a sparkling. He also has a very strong presence within his field. He’s got a soft voice and is always trying to talk and interact with the sparkling. He plays with them constantly and this usually helps give Prowl a break too.
Jazz is an incredible sire. He always makes sure Prowl and the sparkling are well cared for. He makes nests and gets plenty of food for the both of them. He’ll still do chores he’s not good at to give Prowl a break. And if he can’t, he’ll do other chores so Prowl doesn’t have to worry about them. Any way he can make Prowl and the Sparklings life stress free he’ll do it.
Jazz is also very protective of his sparklings. Not to an aggressive degree but he’s got a look but don’t touch policy. Normally he puts himself in between other bots and his sparkling and prowl. First line of defense and first to sacrifice himself.
All this is stuff Jazz and prowl learned about themselves while raising rubble. It’s a different story for the twins. Especially for Jazz.
Jazz learned to discipline his sparklings in a general way and got better at managing the crying.
Jazz more or less took the place as carrier. Unfortunately all things he absolutely had to learn without Prowl.
Jazz’s biggest flaw is not asking for help. And when he does, asking for it in the wrong places.