Yeah those 2 are above the rest... no question about that. The question is by how much.
Honestly between the top 5-7 choices all of the picks are great talents the reason Patrick and Hischier stands out is because they look ready to make an impact on the NHL and are likely closer to make an impact than the rest.
On philly. Honestly I don't understand why they wouldn't be in a win now mode.
They have a great young d-core and Giroux / Voracek in their primes, and barely missed the playoffs. That said I could see why they would just take the pick and let it ride until Patrick / Hiscier are ready to contribute. They can always make other trades to bolster what they need which is IMO a top 4 RHD more than anything.
On Patrick vs Hischier, I think Hischier is the better pick, nothing else but he's faster, more dynamic and is AHL eligible.