The petal diagram is great for new markets: http://steveblank.com/2013/11/08/a-new-way-to-look-at-competitors/
There is plenty of ways to do it. I will mention just some of them:
1. 3 circle model (with common parts) - where every circle repesents different feature. You put the respective competitors in the right place
2. Traditional column chart. You put 3 different charts on the same chart. Every chart is a different feature or KPI; every competitor has 1 column
3. Canva model - you put the cava model of every competitor
4. Snake chart. in rows you have different feasstures and in stead of column you have scale. Every competitor is a different snake graph.
Hope it was helpful