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A1 is the best among the batch but I would have the spade inside an 'O'. Currently it results to at least half a second of confusion as the mind struggles to convert the spade into an A then O.
the bar on the bottom is too thick to my taste. Either make it thinner or thicker to put a white colored tagline in it. Or maybe just put the bar under Plus only.
You could try have a different but still harmonious font face for the 'Plus' but might make the logo too busy.
and Yes, the spade should be black.
