The most expensive strings do not make the most expensive guitar sounds great anyway.It largely depends on what suits your guitar best.
Take the forum members' advice, go with the Medium, then adjust to your own preference.I'm sure you will happy with the result.
2017 Karel Dedain Spruce/Maple (Torres) 64cm
1998 Yamaha GD 10, Spruce/IRW 65cm
1988 Alhambra AL 8, Cedar/IRW 65cm