I'm not a great sailor and have only been on 26000 tonne ships before and felt awful. Last week we went on Sea Princess 77000 tonnes and the rough seas in the North Sea and surround made hardly any difference to the ship's motion so yes I would always go for the biggest ship possible.
I've cruised on small ships (700 passengers) and also large ships (2,500 passengers), and I find large ships to be much more stable..... although if you are really sensitive to the motion, you may still notice it slightly. I also take "Stugeron" tablets now as well, and they have proved amazing - in that I have been through the Bay of Biscay and not been unwell..... I've tried the wrist bands, but these didn't work, and tried the ear thing too, but that was also no good. Other tablets I've tried haven't proved too good either (Avomine being one of them). You can buy Stugeron over the counter, and although it makes you sleepy, if you take them before you go to bed, you end up with a great night's sleep too.... and then during the day, the ship is in port, so you don't need to take one.
Don't know about now but the braemar was quite unstable when i was on it last in 1994 as the crown dynasty. will see next week when i take a cruise on he.
I was terrified about going on a cruise as I suffer badly from mtion sicknessI can't sit in the back of a car, travel on ferries, catamaran etc I cruised with MSC 2 years ago on the opera(about 78,000 tonnes I beleive) got talked into going with friends under the proviso that if I was sick I could fly home from one of the ports of call.Result? I didn't even know I was on a ship. Felt no movement whatsoever. In fact going on my second cruise tomorrow (costa) on an even bigger ship, so good luc.
We were on the Braemar a couple of weeks ago and it did seem to move about a bit. I thinks it's due it's rather shallow draft. Weather/sea conditions will play their part though.
The bigger the ship the larger he swinging (rolling/pitching) arc is so you will get more movement at the top, bottom and ends of the ship. You get very little movement in the absolute centre.
Even on force 7 there is not much movement bill,yor.
I suffer badly from motion sickness so wear travel bands on my wrists the whole time. These are inexpensive (around £10 a pair) and work wonders. They work by accupressure, so no chemicals or sleepiness. I've cruised in the roughest of seas on the smaller ships and don't suffer at all when wearing these bands.
We sailed on the Braemar last Feb and she did move quite a lot compared to larger ships we have been on.