There isn't any gain to making use of legacy address. Having said that When the provider that you are making use of don’t guidance SegWit/Bech32 withdrawals then you may want to use legacy address. Later on you can transfer BTC out of your legacy addresses to SegWit that starts with https://directory-empire.com/listings12710757/indicators-on-how-to-create-vanity-ethereum-address-you-should-know