I have a R-27 with twin 150’s. There are pros and cons to twins. Twice the weight, each 150 weighs almost as much the 300. Twice the maintenance cost. The bottom of the engines are in the water when fully trimmed up due to weight on the back. The engines are so well made, if an engine fails, it is likely bad fuel, there is only one fuel tank so twins won’t help. You could hit a log and only take out one engine, so there is redundancy. You can split the engines so a little easier to maneuver in tight spaces, but they all have bow thrusters. Trolling with one of the 150’s is great, keeps good speed and very quiet, but you are putting hours on your engine and low speed isn’t the best. You can instal helm master with twins, very expensive but cool feature. If I was to do it all over again, would probably do a single 300 with a kicker.
For your purchase, decide what upgrades you would 100% get and price them out. Does it make sense to buy a newer boat with 1/3 the hours and buy the upgrades or buy the older boat with everything you want? The hours on the 2019 are low, make sure annual maintenance was till completed.
Hope this helps.
Sean