I attempted growing some chilli plants some years ago at was not successful with them mainly due to lack of patience since I had grown them from seeds as opposed to seedlings which take less time to mature. If I decide to venture into this area, I would grow bird's eye chilli which is extremely potent and has a ready market.
That's funny you say you did not have the patience to grow from seed. We grew about 20 seeds of multi-color bell peppers. I said I would be happy with one plant, and it was the purple variety I would be thrilled! Well, after months of tiny, spindley unhappy belly peppers, one by one each one died until we had, you guessed it one left. And the miracle? It was the purple variety. 4 months later it is bushy and producing many happy peppers!
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As for the other two plants, it is difficult to say without seeing the fruit. The second one looks like our dragon chili plant, a very spicy long thin chili that can produce red or green chilies. Is the leaf texture waxy or soft and slightly fuzzy (like a tomato?) Are the leaves very thin or thicker?