Litchi is very reliable (more reliable than some of the people that use it).
IIt's the accepted standard for waypoint flight and it will work just fine with your M2.
Hi. Thank you for reaching out to DJI Forum. With regards to this matter. I hope that our valued DJI co pilots can provide you the best recommendation for this query. Just a friendly reminder to please use the recommended DJI application which is the DJI Go 4 to ensure stability and compatibility during flight. Thank you.