Try Godox V1 or new released V1 Pro.

If you want something more affordable, take a look at the Godox TT685II-S. It's a solid mid-range flash with a guide number of 60m at ISO 100. Wireless radio control is built-in and works well with the a7 III. Recycle times are fast and it includes extras like high speed sync and rear curtain sync. Great value for the price.

If you're on a tight budget but still want something reliable, check out the Godox TT350S. It's compact, lightweight, and works well with the a7 III. While it doesn't have the power of larger flashes, it's perfect for event photography or as a fill light. Plus, it's part of Godox's ecosystem, so you can easily expand with more powerful flashes later.

Godox V1 is overall the best choice.

Godox V1 is OK for me.