China or Taiwan: What country is best or possible easy to become a buddhist monk?
Assuming, of course, that you are not referring to people who are either PRoC citizens or RoC (Taiwan) citizens, then the answer is very obvious: Taiwan.
As I recently posted on another similar thread, it is -- I believe -- technically illegal for non-citizens to ordain and receive training as a Buddhist monk or nun in the PRoC. Sure, one could probably find some dodgy jia heshang and send them a red envelope -- they may do the deed, but one is highly unlikely to end up with a proper jiedie at the end of it. But, from what I know, if the SARA gets whiff of it, some deep doodee is going to go down...
This is not to say that the situation in Taiwan is "easy". One could maybe try same red envelope technique -- but again, not jiedie worthy of the term is going to result. So long as one has the proper recommendation from their shifu -- who wouldn't necessarily have to be in / from Taiwan, then could attend a triple platform ordination (not that these happen every week...) But, better still, train at a good monastery with a Buddhist college, and then go to such an ordination from there.
Now, not that I like sounding like a blow hard, but noting that the OP is maybe not a long time member, I'll maybe mention some of my quals for the above claims / statements: I've been in Chinese Buddhist monasteries, both based in Taiwan, the PRoC, Hong Kong and elsewhere abroad, since 2000. I'm ordained with a Taiwanese monastic order, though my actual full ordination was in Australia (run by same order). I know more Taiwanese, Chinese, etc. monastics than I can think of, and talk about them extensively with them. So, I've seen enough from a number of angles, to make the above claims / statements.