Dan Slott run:
I like the Big Time era, Superior, the Red Goblin arc and ASM #801, but since the third volume the story has become bad. Terrible Peter, terrible MJ. There were a lot of good ideas in the third and fourth volumes that were poorly implemented. Stories like Clone Conspiracy are just disgusting. Slott is to blame for the fact that Ben was resurrected and became a villain and now Marvel does not know what to do with him. He also killed Ashley Kafka. But i don't agree with people who constantly write that ALL Slott's runs were bad, it's not true. For example, ASM 655 was a great issue. But people continue to pretend that this and other good comics from Slott do not exist, preferring to remember only bad works (the same thing is happening with Wells now, everyone remembers Shed, but everyone ignores the good works like Avenging Spider-Man. And yet people do not remember the bad work of Nick Spencer, who created the Hydra Cap and turned Harry into a clone, and then killed him). It was a good run, but starting with the third volume, the quality dropped.
Nick Spencer run:
I like all Nick's run except Kindred Saga. He had a great Peter and MJ, he got back Peter and Felicia's friendship and more. He fixed a lot. But the whole Kindred arc was terrible. I especially hate the way Nick treated Harry. It was terrible. The whole Sinister War arc was really bad. I love how Sins Past was destroyed and the twins turned out to be clones, but this retcon was confusing (ahem, Mendel Stromm). But Spencer had a lot of good issue, he understood the characters, he loved Peter/MJ. Apart from Kindred Saga, it was a good run.
I mean, Nick Spencer and Dan Slott did a good job. Everyone has ups and downs. I'll pick Spencer run, but that doesn't mean I hate Slott run and think he didn't have a good job.