I'm using this style of connector:
I'm using 12 ga cord for 150 watts of panel. Max output is about 8.5 amps. !0 ga would likely be better for 200 watts but 12 ga would work with a small voltage drop on a long wire run at full output. More importantly, use 10 ga from the controller to the battery. I also have the Renogy panel and the older Adventurer 30 amp controller with temperature compensation. I relocated the controller to the interior of my Roadtrek, near the battery.
For a cord I have 25' attached to the panel, a short one to jumper the other panel, and a 25' extension cord, all with the above connectors. I have basement storage in the 200V so that's where I have a lead to the controller from the panels.
This system has worked fine for me. I do make it a point to keep all connections high and dry to avoid any shorting issues.
The connectors have been reliable and are quite easy to use.
All electrical connections were soldered, shrink wrapped and taped with a copious amount of 3m electrical tape.