Neither of the above.
First, the microwave beams are going to have an incredibly difficult time hitting moving ships unless very detailed flight plans are filed ahead of time (and deviations for any reason are going to be life-or-death decisions).
Second, as planets orbit the sun, their relative location and distance from just about anything not in orbit will vary wildly. Even in orbit, things will have varying distances between them; eg., the Earth/Moon distance, which is pretty small, as these things go:
The actual distance varies over the course of the orbit of the Moon, from 356,500 km (221,500 mi) at the perigee to 406,700 km (252,700 mi) at apogee, resulting in a differential range of 50,200 km (31,200 mi).
Third, space is vast, so things are going to be extremely far away from each other most of the time.
So, we have beams that are going to be trying to hit a moving target across vast and varying distances. Power per unit area drops off with distance; even with a highly-focused beam, there's going to be some spread, so there's going to be some loss of power per unit area. Then, there's all the "stuff" in space: little though there is, there's going to be dust and asteroids and ships and moons and such in between the beam station and the ship (especially if it's a mining ship), so the ship is going to lose power intermittently and without warning.
Not to mention the question of how many emitters you're going to need, which is going to be at least equal to the number of ships being powered by the system. Or the whole "single point of failure" this sets up for the entire space-based ecosystem. Or the questions of how instantaneous power needs are balanced against multi-second (or longer) communication lags.
It'll be better by far for ships to have their own power generation the vast majority of the time: solar cells, nuclear reactors, even batteries, depending on the assumptions you make about the march of technology.
All of that said, permanent and semi-permanent installations could well take advantage of a satellite network beaming power down/over, especially if said instillation needs to be in a planet/moon's shadow or under the surface or under intense cloud cover (so solar cells won't work). Or, if the installation's in orbit and can't rely on batteries to keep it going for the time it's in its host's shadow. Or, if the installation is just too small or distant to collect enough solar power by itself.
Local ships could also be powered by such a system: shuttles from the surface to orbit or maintenance bots, the ships that don't need to go far from home base. In that case, the better option would depend on the needs of the system, but a satellite constellation is going to give you a lot more redundancy, which is a good thing when you need a flow of power to keep from falling down the gravity well.