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Linette is 0-13 against Top20 players. Out of that, 0-11 is from hard court. She lost all the matches on that surface by 6 or more games, even the one in which she won her only set against a Top20 player. When it comes to the most relevant opponents, there were three defeats to Pliskova by 27 games combined (3x9), to Kvitova by 9 as well and one to Venus Williams (lost the other one by 6).

Muguruza is 13-1 in the last 14 matches on hard court against players outside of Top20. The defeat was to Keys who concluded the great summer with a US Open final. Out of 9 such wins this summer, Muguruza recorded two of those in straight sets and won 8 by 6 or more games. She didn't win against Tsurenko here but Linette cannot be compared to Tsurenko.
Linette was limited under 17,5 in 10 out of 11 defeats to Top20 players on hard court, while Muguruza got limited to under 16,5 in 6 out of 9 wins against Top 20 players on hard court this summer. Of course, the handicap at Muguruza is a good option too.