it really depends on your power and what ninja you have . Lightning wind fire have good high combo chases and good barrier ninja earth has yamato who does beastly amounts of damage with earth main double attack skill lightning has sasuke guy kakashi , wind has gaara wind asuma temar i baki all use iruka also water tends to do worst.

Most people dont have hashirama I usually use.

Yamato
Wind Asuma EArth Main.
Iruka

Or with wind
Gaara
Wind Asuma Wind Main.
Baki/iruka

Fire main
you can go
Anko
Kakashi/wind asuma Fire main
Iruka
if you dont have wind asuma use kakashi And use ekkei bound ninja for f2p ninja kakashi does really good dmg.