Michigan is a bit odd because even with all the weird vote totals/fraud, the Republicans gained seats within the state legislature, despite it being called for Biden for president and Peters for senate. I am leaning towards fraud, mostly from Wayne county/Detroit swinging the vote totals.
The SC election may be due to fraud, but it could also be due to failings on the Michigan GOP. There was zero advertising I saw for the GOP SC judges, even within my Trump voting county. I saw no signs for them, no TV ads, no radio ads. This combined with the candidates being listed as non-partisan, I could see how many voters would break for the judges with name-recognition in the abscence of fraud. I have a feeling the GOP dumped all of the advertising money into house races instead of the SC while the Dems dumped their cash into a wider variety of positions, along with some good-ol-fashioned voter fraud.
However, I have no idea how this is going to play out in court. I know John James, the GOP senate candidate, has flat out said the Democrats cheated, and is willing to go to court and go through the recount process, along with the Trump campaign, but we are just going to have to wait and see.