Good questions, shell0385. To which there are some fairly simple, and complex, answers. 
Come Talk To Me Mix 2 is a 50/50 mix of alpha androstenol (A-Androstenol) and beta androstenol (B-Androstenol). I haven’t felt either one outweigh the other when wearing this product. It’s a purely social mix that draws people into conversations with you… sometimes out of nowhere! Sometimes light and chatty, sometimes a little deeper with more attachment - it depends on the audience and your surroundings.
Instant Honesty is a roughly 70/30 mix of B-Androstenol and A-Androstenol, respectively, plus 2 other pheromones. It is a communication oriented product from Androtics Pheromone Research which makes people feel as if they’ve known you a long time, and encourages them to tell you the truth. It helps create a setting condusive to close feelings, intense rapport and bonding. In the right setting and context, it can lead to intimate, soul-deep one-on-one conversations.
Instant Openness is a 70/30 mix of A-Androstenol and B-Androstenol, respectively. It is a communication oriented product from Androtics Pheromone Research which makes people feel chatty, lively and cheerful. It helps create a setting condusive to good feelings and increased, lighter communications.
A-Androstenol is a purely communication oriented product from Androtics Pheromone Research. It helps create a happier moods and lighter, chattier communications.
B-Androstenol is a purely communication oriented product from Androtics Pheromone Research. It create the impression of a deep connection with you.
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As for MX274, P74 and MX235… now you’re dabbling in an even more fun and rewarding area, if you ask me. 
However, they’re generally reserved for more experienced pheromone users or people who’ve used Androtic’s other Instant products and proven themselves reliable posters of their experiences with these products. Of course, you could always beg…
Anyway, P74 is a putative pheromone with a pretty extensive & strong posting background. It’s been described as “enjoyment” and “instant cool”. It tends to endow the wearer with a higher social status and is highly sociable.
MX235 is the cookie dessert scented version of MX135, an almost off-the-charts popular experimental mix Androtics created some time ago. It, too, has a very extensive and strong posting background. It’s been called the “superstar mix” or the “party girl mix”. It’s very fun and uplifting and tends to make the wearer the center of attention. In the right setting, and possibly combined with other, more sexually oriented pheromones, it can be highly sexual, too. Jasmin @ Androtics has described it as “a gigantic mix, not just of TAH. It’s a massive mix of P79, TAA, TAH, TAL, TAF, A-Androstenol, cops, pretty much everything and the kitchen sink went int there.”
Just search “MX135” & prepare to be amazed. IMHO… this should be a product added to the Instant line immediately and be sold in 55 gallon drums!!! 
MX274 is a fairly newly released mix. No info yet on what exactly is in it, but from my own experience, I think it’s TAL heavy… possibly a TAL version of MX135? But that’s just my own opinion. There have been some very promising posts about it, but you should find out if you’re a TAH or TAL woman before getting this one. Search “MX274” for more information on it.
With this information, it depends on your goal and target audience as to which product you want to try… first. 
They all have their appropriate places and times. HAVE FUN!!!
