breastplate or breastcollar for horses?

the breastplate keeps your saddle from slipping,

the standing attachment give you more control and restricts your horse from flipping its head too far up in the air (usually for jumping)

for the reasons.. has your saddle been slipping more often? Have you been doing more jumping? More poles? Have you been riding more often? For longer periods of time? Have you changed saddles? Started using different saddle pads? You'll have to ask your trainer for the exact reason.

Good Luck!

A breastcollar gives more freedom of movement than a breastplate. Also I don't know why your instructor advises a standing martingale attachment, but I'd advise against it. When I first started riding hunter-jumpers back in the 1960's a standing martingale was routine tack, as much standard equipment as a fullcheek snaffle. So I used one too, just like everyone else.

Then I started taking dressage lessons from a German-born student of Reiner Klimke. He wouldn't let me in the ring with the martingale attached. It was explained to me that a standing martingale just reinforces the head tossing behavior that you're trying to correct, and if you put one a horse that doesn't toss his head you can ruin his topline as he learns to lean into the martingale to avoid the sudden jerks on his head. A martingale is no substitute for good hands.

Don't use it, please.

She must want to have you use a running martingale that comes into play when you shorten the rein (it slides on rings the reins run through)makes for more control of head tossing and gives rider much more leverage if needed. The standing martingale is stronger aid then the running, it is set at a Fixed length so the horse no way can throw its head in your face.

The breast plate keeps the saddle from sliding back. The standing attachment can be used for a tie down, like a standing martingale.

We have always used breast collars on our horses, even when I was a kid. We have always had roping/ranch horses & they do keep the saddle from slipping back especially when it is a heading horse or when you are going up hills gathering cattle or checking fences.

All of our Quarter horses have nice prominent withers, so slipping forward isn't a problem.

A breast collar is to help keep the saddle from slipping back..

Apparently your instructor is aware of your saddle being off center or slipping backwards, otherwise, why would he/she even mention it?

Here's a great idea. Ask your instructor why she had you buy the breastplate.