If you send BUSD from Binance to any BEP20 address, there is no transaction cost; they have a comparable feature. And, as you mentioned, they're also popular in BSC; most investors are using BNB and investing in BSC projects, particularly in NFT games under BSC; people are really into it. A lot of projects have been created in BSC, and the majority of them are pumping like any other altcoin; even currencies that are mentioned or searched in any social media site have been created in BSC.
For me after using both BSC is more adoptable because they have much better features and development is also going on with good speed and devs have some good community back up as its popularity is also growing very quickly recently even Tron is also good and fast, but sadly we have not good use case about this. Investors see the value and advantages of successful BNB in crypto investing.
Recently we have NFT games mostly are currently in BSC which is excellent for this and investors as we have some good future of these games.