10 is very low and could cause problems if your network is slow to register and connect as you could be rebooting the router before it had even connect.
longer like 99 will take a long time so if your data is needed timely and there is a problem then it could be hour or so before the reboot recovers the router.
you should also use thes with other surelink settings to check the connection is live and not stail. this will also help to disconect PPP and uncremetn the counters that the 2 commands use