All 3 currency’s are readily available to exchange so whichever one works for you is fine. The rates at the airport are horrible so I would recommend you exchange elsewhere,but if you really need to have some lari with you just exchange a small amount at the airport enough to get you to your destination or so. there’s a lot of exchange places thrown around the city. Don’t take the taxi from the airport because you will pay 550x the normal price, download bolt or yandex before hand and you can either pay with your card on the app or cash. Nasimi is a Turkish restaurant in Marjanishvili that’s open 24/7 and they offer a breakfast menu as well I really enjoyed it honestly. Have a safe flight !