Site to Site VPN- Best Method

Question

I just upgraded our 4 firewalls to XG (latest build). We use IPsec firewalls. When a firewall is rebooted or there is a power failure the IPsec VPNs do not reconnect on their own. I have to mess around with both sides of the tunnel to get them to connect again. I created a new SSL VPN between two sites and it works fine after a reboot. What is the current preferred method for Site to Site VPNs, IPSec or SSL? If it is IPSec why wouldn't my VPNs connect on their own after a restart. Thanks. 
 Jae

Panagiotis Vakerlis · Answer

So all your firewalls that connect to each other are XG? If so, SSL Site2Site or RED is best case senario. I use both on various companies and it's recipe for success. A bit tricky though if you want to make mesh network rather than a star, but still. Reconnection happens as soon as the fw is online.