Join MTS files and transfer to Galaxy Note 4, help!

I want to join some MTS video files into 1 file and export to play on galaxy note 4. Considering galaxy note 4's high resolution, I obviously like the best quality what is the best format to convert to? Should I do this in iMovie or would I get a better result using another app (free, preferably) and what settings should I apply?

Thanks for any help.

 

You could try this free video converter to join the video files together and transcode the .mts to an .mp4 file using one of the presets. Galaxy Note 4 will be able to read .mp4 files with H.264 codec.