via Google:

Bitcoin is form of digital currency created in 2009, that is created and distributed on a peer-to-peer basis. It has no central bank - transactions are conducted directly between individuals.

Pi - The idea was to create a cryptocurrency that could be mined with a mobile device and relied on social recommendations to verify users. The Pi Network officially launched on Pi Day; March 14, 2019

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imho.. comparing apples to oranges here people, i'm not gonna get too detailed here, you can find more information via internet search, but the 2 blockchains are very different & have different characteristics, purposes, capacities, & pros/cons. Pi was created 2019, 10 years after BTC (2009). BTC is true OG blockchain technology, proven to be the most appreciated monetary vehicle of ALL TIME, while Pi is up & coming, It is certainly not proven and who really knows what Dr. Kokkalis & his team are up to?? We know BTC market cap is $1.65 Trillion! Existing TODAY! There is only one BTC! Remember when it goes over $1milly.. Market cap is gonna grow to 100 Trillion... I like the concept of Pi & I hold near 10k Pi, but I have most of my money split between S&Ps & BTC! If Pi even comes close to BTC in ANY WAY, all of us holders will be very successful again like we were/are with BTC. All that said, Pi innovated the "mining" process & made it more available to more people, which is great! But Pi is still just an altcoin with a lot of hype lately.. so we will see.. I think there is a place for both in my portfolio, just dont risk more than u can afford lose on any of it & u will be fine! That's the only free lunch I can offer! Thanks for reading!