Yup I either sign Nola or I'm shopping in the Taijuan Walker/Michael Lorenzen aisle (barring a Japanese pitcher). A big part of Nola's appeal is no draft pick.
Snell is also a year older and has just not been the pitcher Nola is, except for that 2018 season and now this one. Would sooner buy low on Nola (if that is in fact possible) than high on Snell. Both are recency bias. Snell's peripherals not that great this year either (still having a better season than Nola obviously, but they are red flags).
Snell also hasn't shown the ability to give you a ton of innings. You can say that's a positive (less wear on him) but it also might not be.
My gut feeling is the Nola situation won't be that protracted. It could be like Freddie Freeman, it could be like JT Realmuto, but either way it will happen reasonably fast. If the Phillies truly believe Nola is heading into decline than by all means stay away. But any over-30 pitcher might be.