Both would be easy to sell if you price them right But I'd say the 10oz in general as more people would have the cash and more likely to part with it. There's no way of knowing or predicting which will spot (if at all), just a gamble you'll have to take if you're deadest on Koalas.
In terms of size, like what House said 10oz is probably more liquid. As for milkspots, it's pretty random for stuff coming out of Perth, but def no where as common as them Canadian rubbish.
I agree with others on this thread. The biggest benefit of the Kilo is the lower premium (if you buy from the right dealer). Many times the premium can be about 1.50 over spot...which is a steal in my opinion. Many times the 10 oz has a higher premium, BUT maybe you capture that premium back over the long-term. My humble opinion is that the Kilos will do better once the declared mintage is made, I believe in 2019. Not sure if that is the case with the Koalas, but it is with the Lunars. All the best.
@barsenault The Koala kilo coin mintage will be finished at end of each calendar year. No remintage possible as with the Lunar2 Kilo coins. The questions 10oz versus 1kilo is no longer a question: The 10oz coin wont be minted any more. Have a look in PM bullion blog on Thursday 13th: www.perthmintbullion.com/Blog/Blog.aspx
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