$LYFT has all their eggs in one basket. It's a pure bet on US rideshare, which has been plateauing for quite some time.
$UBER has a global presence, and although lost in Asia owns a substantial share of Didi (#1 in China) and Grab (#1 in South East Asia), and now bought Careem (#1 in Middle East), and is still dominant in South America.
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It also has Uber Eats, which has grown to a multi-billion co on it's own.
It's also much further along on proprietary self-driving tech than Lyft is.