I'll swear by the Aeropress esp for travel since it's plastic and lightweight. You can get the metal filters to be eco & travel friendly.
In my personal order of importance for good coffee:
1. Beans
2. Water Temp
3. Method
4. Grind
A distant 5 is process and by process I mean exact steps, timing etc. If you follow the world champion steps[0], even loosely, it will significantly up your coffee game. While you don't need a fancy grinder at all, I def covet the EK43.
Also much love for a V60 for travel as well.