Hi @PrivateAnalytic , I would say there is no BEST way, but many good ways to approach this based on your particular needs.
https://powerbi.tips/2016/07/measures-month-to-month-percent-change/ shows a good example of visualising month by month variance.
Another approach could be to show the Total miles run and MOM% change together in a table that utilises conditionally formatting to highlight strong performers/ months etc. https://hevodata.com/learn/power-bi-conditional-formatting/ delves deeply into this topic.
If this answer solves your problem please mark it as a solution!