Hello Dick,
As I'm sure others will also say, the choice depends on what you want the boat for. If it's racing, day-sailing and occasionally sleeping aboard, with the emphasis on speed, the First might be suitable. But if you want a proper 'pocket cruiser', the 235 will be a much better choice. I've recently bought mine and I'm delighted with it. I've just returned from a week's cruise with my wife and two children aboard and the boat was superb - in fact, I didn't want to stop sailing and come home. I don't think we'd have been that comfortable on a First 210/21.7 - the accommodation is much more basic and less practical, with less stowage space.
I know someone who bought a First 210 last year and now regrets it. Its keel arrangement means that the trailer has to be submerged deeply to float the boat off. He paid for his yard to launch and recover the boat for him but they can't do so with a tractor. The only way is to lower the trailer in on a rope, which the yard won't do. In contrast, the 235 floats in a foot of water and, if you have a break-back trailer with rollers, it can be launched with a car without submerging the trailer axle.
In addition, he discovered that his keel-lifting mechanism is broken and the only way to come at it is to have the boat craned and propped and to lower the whole assembly out the bottom. Again, contrast that with Parker's lifting mechanism.
As you point out, the First needs beaching legs, so doesn't compare with the 235 as a proper lift-keel boat. I spent 5 nights this week drying out at anchor; the 235 sits absolutely upright and she settled so gently it was undetectable (v. good anchorage, though - just NE of Golant on the Fowey River).
For me, though, even more important than the 235's practicality and shoal-draft usefulness is her sailing performance. I don't know how it compares with the First's performance but I doubt there's a big difference. She sails beautifully and is very well balanced. She slips along in light winds very satisfyingly, responding to each puff. And she also punches to windward in a sea just like a 'proper' yacht - which, with her keel down, she is.
I'm sure the First is fun to sail - and I'd certainly like a go on one - and I think the 21.7 is a pretty boat. But is it designed for the sort of sailing you want to do? If you want to go trailer-sailing and cruising, I'm sure the 235 is a superior choice.
Anthony Russell
235/02 Sea Wyche
Anthony Russell
235/02 Sea Wyche