Of what's in STO, Mogai and T'varo look the best. D is right behind them. Now other games have non-canon Romulan ships that look good. The ship design staff in STO did ok with the Dhelan but the rest of the non-cannon ships are oversized and resemble adult toys rather than birds. They really should find some more creative artists. The Tal Shiar ships are beyond ugly.
The Tal'Shiar ships are based on the Narada from the Star Trek movies set in the JJ verse. Though they are not strictly canon, they are much closer than every other ship in this game that isn't directly lifted from the show or a movie.
From a statistics standpoint, you are correct. However, I would gladly trade crew size for hull and/or shields in a heartbeat.
i can see the ha'feh as a smaller ship, since it technitally is the battle section but the mogai is a kilometer across, this was clear enough comparing its size to the sov in the movies.
except that cryptic said "heapie derpie escourtie" and made it spin like a top simply because "lol".
which is a shame.
i had been looking forward to the mogai as a ship for my rom, but turning so fast a quarter of the ship is in reverse and any of the ships on screen grace, is replaced by stupid *****y derp & wobble was too annoying & immersion breaking to be tolerable.
not to mention complete *******t in regards to what was seen on screen from the kilometer across ship.