Here's my assessment of the two chains (though each place have girls who are exceptions to the rule):
Pure: PSE types mostly with enhanced boobs. Nicest facilities. Impossible for walk-ins.
Perla: a mix of Pure/Flirt Finch, some PSE and a few avg/low mileage girls thrown in. Better balance of natural vs enhanced girls compared to Pure. Quality of facilities very similar to Pure despite the age difference.
Flirt VP: mixed bag of girls - some super hot, some worn out worst than the strippers at Caddy's. Above avg mileage, avg/low sensuality. Overpriced compared to the market rate. Facilities are like a decent hotel.
Flirt Finch: best bang for your buck, avg to low mileage, mostly GND and natural girls. Facilities are hit and mix depending on the room. Good for walk-ins. Open the latest for night owls.
Platinum: best bang for your buck if you're a mileage seeker, mixed bag of girls, tiny lineup, shitty parking, crappiest facilities
Studio 9: a fancier version of your rundown holistic spa, lots of FOBs but a good lineup of CBAs, shitty parking, showers takes a while to warm up
For physical attraction level, I would rank them as Flirt Finch, Perla, S9, Flirt VP, Pure, Platinum
For mileage, I would rank Pure, Platinum, Perla/Flirt VP, S9, Flirt Finch