I have Victron very happy. Mastervolt is very good too. Really couldn't go wrong with either. Victron seems a little more price
competitive in the US.
The combined inverter/chargers from both companies offer two advantages. (1) They will reduce the charger amperage automatically to avoid overloading a shore power
cable during high AC usage (2) Under very high AC usage - such as a A/C compressor
surge - they will use the inverter to augment the genset/shore power. This can allow you to install smaller gensets and/or pay for lower amperage shore power.
I believe that the Victron offers a higher "pass through" amperage where more amps can go in and come out from the external supply than the Mastervolt but not sure.
The Victron (may be true of the Mastervolt too - don't know) can be connected to a laptop
for much easier setting/changing of the parameters. Much better than fooling with dip switches.
Check if your current
60 amp charger can be set for a "minimium absorbtion time". If it can't, it will probably instantly go into float mode when the other charger comes on line.
The biggest challenge between 230v and 110v is that you are also changing from 50hz to 60hz. Transformers don't change hertz just voltage. Many electric
motors - specifically AC compressors - really hate the wrong hertz. You can easily overheat the motor
and burn out the windings. One solution when you come to 110v land is to use an auto-ranging charger that accepts both voltages - many do. Plug
the charger into 100v 60hz and use the inverter/charger as only an inverter to make 230 50hz power for the boat. If you don't have any hertz sensitive motors, you can just use an inexpensive transformer but be careful as many of the cheap
230-110 "tool transformers" are not rated for continuous use.
With this much charge amperage make sure there are temperature sensors on the batteries for all chargers.
All of the above wiring
requires expertise and care. Don't fool with these voltages and amperages if you don't know what you're doing.