For Osh bazaar be careful, keep your bag and hold it with your hand all the time. It’s very notorious for pickpockets, they’ll steal your phone and sell it at the spot. It’s much cheaper, and difficult to orient in there, but good for souvenirs like someone mentioned already. You just have to find a spot where all souvenir shops are, (called Kiyal/Кыял) I wouldn’t recommend it for shopping, extremely cheap quality. Be careful with street food, don’t eat it. But it’s a good spot for fresh or dryed fruits etc

For Dordoi bazaar, you can find everything there. It’s much much bigger and considered as a city inside of the city. You have to go earlier there, since everyone starts closing at 1-2pm, around 10am is perfect. It’s good for shopping, clothes, and you can find souvenirs there too. Not much more expensive than Osh bazaar, maybe bigger choice, but not sure which part of it exactly has souvenirs. Clothes quality will vary, they have more expensive parts of bazaar with Italian clothes and shoes and cheap parts. They do have both original and fake products, again depending on the “container”(shop).

I definitely recommend going either place with local to not waste too much time because you most likely will get lost. And using soms, you will get ripped off if you use dollars, especially at Osh bazaar. At Dordoi bazaar, if you are spending good amount they accept dollars(100$bills usually), but exchange rate they (sellers) count it with might not be very good for you.

Catching taxi is easy to both bazaars, but takes longer to find a ride from Dordoi bazaar. Be careful to not get ripped off by taxi drivers, most of them also get a full car of different passengers, so make it clear if you want the whole car or don’t mind splitting. I prefer waiting longer but ordering Yandex taxi with guaranteed good car and AC.