Have used both cameras.
Much the same.
Both awesome with integral osd for volts ( and time n name if one wanted) and very good cams. ( remember to switch dwdr to on in the menu )
The arrow volts display is adjustable ( you can add or subtract to the volt integer ) not sure the swift is.
I prefer the arrow as I like a 2.8 lens and the swift , I think , has 2.5 as its narrowest option. ( though obvs both are changeable )
The swift side-mounting screws are possibly better.
As far as weight of craft goes , seems years since any one was fussed ( apart from micro ) certainly with the fancy motors you mentioned I think it would be a hard job to keep it down !
( my 180 with boring 2205 is 350g then has +50g for hd dvr cam and +150g for 4s batt.
It doesn't hang about )
Remember that any fpv cam that is powered direct off flight battery will sooner or later fail ("voltage spikes") with modern active braking escs