Hard pick to make, obviously it dependent to several aspects: type of terrain, type of enemy, engagement distances, type equipment the enemy has (body armor, weapons), the mission tasks, type of movement to contact (mounted, dismounted, air assault), what support assets are available (indirect, CAS, etc) and the mission equipment assessment of all of the above.
Generally speaking, I like having a 7.62 mm weapon of some kind in the squad. Now if I had the ability to pick and choose, I would like an EBR (SDM), a 240B team, and 2 fire teams with standard load out. A 60mm will be a great added tool, especially for Astan. However, again it would be mission dependent.