What's the difference from buying coins than regular silver bars?
Per se, none. There is, however, one possible wrinkle where coin may be a better investment: confiscation. There are several notable cases of governments unilaterally confiscating precious metals, usually with little or no compensation, by fiat. The bastard Roosevelt did this and the only people who escaped were those holding "antique" coins and jewelry.
Therefore, if you are going to stockpile PMs, it would be wise to consider the distinct possibility that Obammy or the next low-rent tyrant will declare a national "emergency" and mandate all persons turn in their gold objects. Given the capricious nature in all of this and the depths to which the tyrants have sunk these past few decades, it is possible that exceptions for jewelry and precious coins may not even be extended. Such is the cold viciousness of the current raft of vermin running the three-ring. But if perchance they show that much magnanimity, bullion will be the most undesirable form of PM and one will then be faced with the decision to turn it in, keep it illegally (rendering you a "criminal"), or having it converted to legal forms (which I do for a fee, BTW... silver/goldsmith here).
The ultimate truth here is that nobody knows what these lunatics will foist upon us next. If holding bullion becomes illegal, then the material becomes valueless in all markets save the black and transacting there is always risky business where prices are commensurate with the risk. These bastards have us by the balls, make no mistake about that. Personally, I will give up NOTHING. Not a stitch to these thieves in costly suits. Not a grain of metal (not that I really have much at this point), not a single firearm, dollar bill, nor a thread from my clothing. As far as I am concerned, they may all go home and kill their families and then themselves and make the world a better place. For that I would thank them, but will give them nothing more.
Get your metals and worry not much about the form. If shit comes to shove, you will be faced with making decisions in any event. The best case is that PMs are not confiscated - possible, but as the economic situation deteriorates, it becomes less likely an outcome. If they are and there are exceptions, get any bullion you hold into another form. Get things made into makeshift jewelry. It doesn't have to be pretty - it just has to be good enough to cut the mustard. If there are no exceptions, you are fucked.
Bullion tends to be less costly because there is no "value-added" in the coining process. I would go with that, personally, but there is one more possible concern: confidence. There is a confidence factor that silver/gold in COIN form is less likely to be counterfeited. Certainly it takes more work to counterfeit a coin than a bar of bullion. But crookedness being what it is, I can readily see people out there coining tungsten blanks and putting a goodly plate over it and calling it good. Short of cutting into every coin that comes across one's counter, one must simply trust that it is genuine, so once again I would not waste time on this. If things go so badly that we are reduced to these means of transacting business, I suspect purity may become a distantly secondary concern, meals and shelter taking center stage.
Good luck to you and to everyone. We may need it sooner than later.
