17, and 18. 17 is at least in the same league as Gohan, who was able to handle the Namekians themselves. And 18 is more helpful to 17 than Piccolo is to Gohan and are much more in sync in a battle like that where as Piccolo and Gohan it was Gohan saving Piccolo, and fighting both at once, it'll be 17 and 18 switching up targets, and just being much better at the teamwork aspect.