Advice needed: AliExpress refund or PayPal chargeback for failed transaction

[A.V.G]

Hello All,

In mid-November, I purchased a frameset on AliExpress and the seller has failed to fulfill the order (80 days and counting). 
AliExpress sends me an email about every other day encouraging me to 'apply for a refund'.  I can also go through PayPal to recoup my hard earned $$$. 

My question is, is there an advantage to using one method over the other?  Will I get my money back faster through Ali vs. PP?  Does Ali ever keep part of the funds, or are Ali refunds always 100%?  These are the things I'm thinking about. 

Any guidance here is appreciated.  Thanks!

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Final edit Feb-22-2025:  My order was eventually delivered after ~75 days in transit and 90 days after order.

[00Garza]

Aliexpress refund has always worked for me when I open a dispute. Hasn't been many times, but it's been pretty hassle free.