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Probably splitting hairs. The overall quality of the bullet construction will make more of a difference. Terminally, the JHP probably holds together better.
A JHP has a jacket, a TMJ does not. Plated bullets use cast bullet data.
You'll find that shooting any kind iof jacketed bullet gets expensive quickly. Your local gun shop can and will order anything you want in any quantity you want. Be prepared to pay up front.
You also need to be aware of the type of gun u are planning on using plated bullets in. Plated do not perform well in a barrel with polygonal rifling UNLESS they have a plating thickness greater than .004. The rifling can actually break thru the surface and cause them to peel on exit from the muzzle. You also have to be careful in the amount of crimp that is applied. Not all plated bullets are created equally. Some are double struck to ensure concentricity post-plating while others are not. Check before u buy as you may be surprised at the results
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