A panel. Panels spread over hundreds of thousands of square kilometres produce power averaged over that area, so they're much more consistent and predictable.
HVDC lines help with this a lot. It has gotten to a point where there are serious plans to build a long, undersea HVDC line from the UK to Morocco which, get this, is poised to cost less than the equivalent(GWh delivered annually) Hinkley Point C nuclear power plant:
Glad it will work there. There has been local opposition to new transmission lines in the USA (see Maine recently) so when folks say “just build powerlines” all I can think of is the difficulty of the land assembly and permitting. Technically it is easy, it is all the humans in the way that make it hard.
HVDC lines help with this a lot. It has gotten to a point where there are serious plans to build a long, undersea HVDC line from the UK to Morocco which, get this, is poised to cost less than the equivalent(GWh delivered annually) Hinkley Point C nuclear power plant:
https://xlinks.co/morocco-uk-power-project/
That's how cheap the combination of solar and HVDC is.