The most achievable? I'd say the higher percentage of strikes at the shorter odds rather than lower percentage at higher odds. Less skill involved. But what volume of races over what time? It is relatively easy to get a 80% strike rate by betting on absolutely sure things - one horse massively backed in the market in a field of roughies - but there might only be four or five of them, absolutely sure things, a year. If we want a decent number of races per week, i'm not sure which is easier to achieve and why. In theory shouldn't the return be proportionate to the degree of difficulty either end of the scale? Then it depends on the punter's temperament. It might come down to, Are you into precision or the more scatter-gun modes of betting?