Go with the Tattersfield! I'm running two WA-1s on my Tat. From what I've read the Tattersfield has one of the best designs for air fuel flow. I would also say go with the Carters. They are the best carbs I've has on my 235. One more thing! Do your best to get a matched pair of carbs. If they have the tags still on them see if they share the same number. This is a very important thing when running two carbs.
Dom