This is an area where have no experience so looking for suggestions. My situation at home is as follows. In my Family room I have a CSS324-24G-2S with various computers, WiFi, lighting controls, and monitoring devices connected. Both my DSL and cable internet connections also come into the Family room switch. In my garage data cabinet is a second CSS324-24G-2S switch that has both RB750 routers, three unattended use computers, environmental monitor, IP controlled power switches, and several WiFi APs. There is currently a 1Gb/s ethernet connection connection between the switches. Because the routers are in the garage and both internet services come into the Family room, obviously the link between the two switches is critical. There are about a dozen VLANs on the link between the two switches. I plan shortly on adding a second link between the two switches that will be 1Gb/s multimode fiber that will take a completely diverse route between the house and garage.
That leads to my question. My objective for having the second link is reliability in the event that one path fails. As I understand it, I can do this with either RSTP or LAG or a combination of both. I am sure there are advantages and disadvantages to each. I have done a fair amount of reading about both, but as I said, I have no experience along these lines, so looking for opinions, suggestions, etc on the best way to set up these two paths.