there is no general better solution.
It depends on what you want to achieve, the type of servers [do they all have the same power ?], the type of traffic, ...
I would suggest to use the default which is roundrobin.
If you see problems like more traffic to one server, or a server being heavy loaded while others are not, you can then try leastconn or something else like weighted round robin.
Regards,
Gilles.
