You can do the analysis on layout of the two, so I'll ignore that. Big differences.
Both have Volvos, but the RT is pod drive double Volvos vs straight shafts in the double Volvos in the Swift. A big consideration in your preferences.
If you spend time in the Tugnuts site given above you will begin to see some themes on the Rangers in general.
Until the 41 came out recently, the whole point of the line of boats was to trailer. So think light weight, and the key design elements built to fit within trailerable max measurements. All the while, stuffing as many sales "features" into the size limitations as they can squeeze. All of which makes good business sense in that trailerable mission.
So in squeezing in all of that stuff, you can't get to anything for maintenance without disassembling something else first to reach it. Its a consequence of packing in features.
There are a couple of knocks on the smaller Rangers, but I have seen little written on the 41. Wiring. The wiring runs seem almost random from boat to boat even within a model size and year vintage. Go to repair and replace something, and where it "should" be is only a starting point. Yours is likely to differ. Wire sizes are the minimum they can get away with. Power to the electronics Garmin grid is not done to spec and is insufficient, causing gremlins of various kinds. Fuses are scattered into various odd and sometimes inaccessible places. The main breaker panels are in odd places, and sometimes scattered instead of centralized. So again go back to the fact they pack all bells and whistles and gadgets in, but then they implement it poorly. I really don't know if that carries into the 41, but its just a topic for you to look into.
The second knock is the engine compartment on the smaller boats. I have not seen even any pics of that on the 41. Another topic to look into. The engine compartments of the smaller boats are in a lazarette in the cockpit. They are poorly ventilated, causing insufficient air flow to feed the engines (barely acceptable, but barely) but also excessively high air temp for the air feeding the diesels. Owners have sometimes made a project of trying to address this in way that help but not fully solved it. Again, something to look into for the 41.
Ranger owners report nagging water infiltration issues that are hard to trace, but once found tend to be either hull / deck seams, or from around insufficient bedding of ports and deck hardware.
I have not seen any pics or descriptions for the Swift. Both are volume production boats designed to be light weight for speed, so its possible both have some of these issues. I have noticed before that the Swifts don't show and don't mention the engine room, so it must not be something they are proud of. Both boats feature lounging with a glass of wine more than construction and maintenance issues.
I guess the general advice is to get below the skin level on both to see what's what.
For smaller trailerable boats, the Rangers fit a mission for many people. But I didn't understand what they were doing with the 41 when it came out. They moved out of the niche they have a commanding share of. At the 41 price point there are many more options for buyers to consider, whereas in smaller / trailerable there are fewer good options. $850,000 plus some options costs for a Ranger 41 opens lots of other choices.