You don't need MPPT just because your battery is 12v.
With the Victron you'll get a benefit in information, but not charging speed.
This debate on PWM vs MPPT has been going on for years. Now if you want to wire your panels in series with higher voltage you can't with a PWM SCC, but for your system you'll see no charging benefit. With a simple 190 watt setup you will get no real benefit from MPPT. Theory yes, real no.
Our camper with a 170 watt GoPower panel also came with a GoPower SCC, but once we changed to a Victron 100/30 saw no difference in charging time. Except, Victron will tell you are 100% charged when it goes to float, whereas GoPower tells you are 100% full only when you are actually 100% full, so with the Victron you get a false reading making you believe your batteries are full. I've found others who have realized this flaw with Victron SCC's.
When not on the road our camper sits in a seasonal site eight-tenths of a mile from our condo. I play with the readings all the time. Last June I was at the camper when I watched the Victron go from absorption to float. At the exact time the monitor jumped to 100% full. I immediately disconnected the solar, waited five minutes, ran the water pump for perhaps 20 seconds and took my multimeter and measured the voltage. My batteries (lead acid SiO2) were somewhere between 90-95% full. I did this a year earlier with our AGM's and found the same scenario.
On the other hand if you want to check how your setup is working or have a potential problem you get history with Victron SCC units and even more history when you add a Victron 712 battery monitor. The two work together. Last January it quickly diagnosed our AGM failure and found the WFCO charger had decided to throw 21 volts to the batteries, destroying them. The WFCO charger is now disconnected and has been since last February when we got our new batteries. Don't miss it and don't need it. FYI, we don't have a DC-DC charger, and for our needs don't need one.
In all fairness, in the fall, winter, and spring our 170 watts was more than enough for us, but last June we added an additional 300 watts to our camper (465 watts when accounting for mixed panel loss), wired in parallel, to help with shading we get where we camp in Minnesota in the summer months.
We had the discretionary income, and had seen a previous battery failure so purchased our Victron 100/30 SCC and 712 BMV to better monitor the system, and it did show us the WFCO failure. So far our current batteries are running perfect, but the Victron system gives me lots of info that I don't need until something goes wrong.
If you have the discretionary income, love to watch electrical monitors, and play with your system, ditch your GoPower SCC, otherwise you're just fine.
OTOH, you already have the Victron controller, so why not install?
Enjoy,
Perry