self- directed IRA vs solo IRA

[Jim Chung]

im curious what is the difference between these 2 IRA in regarding property investment under IRA rule?

here are many custodian who would open the account for you. the problem i know is the fee/ mainteance charge from the custodian and is vastly difference from one custodian to another…
do anyone have recommendation for a custodian who does self directed/ solo IRA?
i tried vanguard/ fidleity . but they dont offer that

thanks