This is what I look for for "specialness" in synastry charts:Angle connections. ASC/DSC conjunct MC/IC etc
Vertex connections. Conjunctions or oppositions only, under 3 degrees
Sun on the angles
Moon on the angles
Sun/Moon connections, under 5 degrees
Midpoint action (under 2-3 degrees).. Sun/Moon or Venus/Mars (maybe even Venus/Pluto)
North Node/South Node connections to personal planets, conjunction or opposition only, under 5 degrees.
In the first chart, you have Sun & Moon conjunct as well as Sun conjunct South Node.
The composite chart has Sun conjunct Mercury, I wouldn't count the conjunction to Venus because the orb is too wide. The Moon also makes a worrisome square to Saturn, as well as Uranus.
The second guy has Sun/Moon again, with his Venus conjunct your Sun/Vertex and his Vertex also close by (although, it's probably not a real birth time so then his Vertex is probably not actually there).
The composite has a 10th house Sun, close to the MC, which is nice. But the Moon is in the 12th, yuck.
3rd guy has the same stuff as the 2nd guy, but with Venus conjunct MC & his MC hitting your Venus/Mars midpoint (assuming he has the correct birth time...)
Again, almost the same composite as the 2nd guy but this time the Moon is conjunct the ASC (assuming he has the correct birth time) which is a lot nicer and makes for a stronger composite IMO.
So if I were to rank these I would say: Guy 3, Guy 1, Guy 2