PhilKing, on 2014-July-28, 04:54, said:
The sequences are essentially symmetrical (except they aren't, but bear with me) so what is the benefit. The difference is that my way avoids languishing in 2♥ when cold for slam in another denomination. I get to show hearts by bidding them and three suits by doubling - you do not always get a second chance when you overcall this strong.
And the reason the methods are not symetrical is that at some point, a 4513/3514 hand becomes too strong to overcall whatever your style. I like to double when 2♥ can lead to playing there when cold for a grand somewhere else, this may be old-fashioned, but it stops the silly results. My method of of double followed by 4♥ if they boost to 4♦ is unambiguous - it DENIES 6 hearts (if it gets me to a 4-3 spade fit now and again, that is fine). Yours promises six hearts (or the equivalent) so you sometimes have to double with this shape and miss the 5-3 fit. Conversely, if I overcall 2♥ and then double, I promise 6 hearts and 3613 or similar.
Also the 3631 hand strong enough to double then bid hearts is rare - it's a useful sequence that is massively underused in your scheme. I've produced booklets from my database generally consisting of 60 hands for nearly every preempt under the sun for my various teams which we bid and then compare with the original auctions, and by far the biggest technical error of even world-class pairs, is the massive underuse of takeout doubles on shapes like this (the biggest non-technical error is rampant overbidding with "slam invitations", but that is another issue).
In style for me, you don't bid bad suits with known good hands if you can avoid it, so (2♦)-2♥-(3♦)-P-(P)-X makes less of a promise about the heart suit than doubling first then bidding hearts which would be at worst a good 5 card heart suit with the same point count, if I had 6 decent hearts I'd have bid 3♥ first time although what I do with 6 good hearts and 4 spades is not clear, I'd be worried partner took me for that if I doubled and bid 3♥.