Besides a 2x2 matrix and a table, what are other ways to depict the competitive landscape in a slidedeck?

The petal diagram is great for new markets: http://steveblank.com/2013/11/08/a-new-way-to-look-at-competitors/

Venn diagram. Each competitor gets a circle, so that you can show your overlap with competitors and also show your competitive advantage/key differentiators.

Hey
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.
etc
Hope it was helpful

Your competitive advantages should be one of the two most common items on which to think when considering how to fill your competition slide content. The main competitors to a market and their relative positions are the main scope of Gartner’s magic quadrant, which is the most well-known graph in competition slides, to be honest. Going for a petal graph, for example, means you will be able to position diverse competitor types across more axis, which should help position your start-up or business at the centre of a more complex web of differentiating factors. Otherwise, there is a lot to gain with the traditional quadrant’s analysis, as well. Some might disagree with the use of this quadrant altogether. However, if you modify variables to it, meaning you mold what criteria weighs in on your competitor analysis, then your quadrant works its name’s magic to help you create new and diverse analyses tailored to new markets or clients. Beyond your pitch deck presentation or demo day, the competition slide can help your internal vision about your own business in amazingly effective ways. The competition slide should be enlightening of your needs, yet also help guide your priorities.
Besides if you do have any questions give me a call: https://clarity.fm/joy-brotonath