Would a LED or Regular Flash Be Best For Me?

At this time I am only using the 50mm F/1.8 doing models or promo girls in Miami Beach.
My Flickr site - https://www.flickr.com/photos/lautermilch/albums

I am tempted by a LED flash to improve lighting but am unclear of how far they are effective.
Any suggestion of the best flash for me?

Flash are rated by Guide Numbers

https://en.wikipedia.org/wiki/Guide_number

Here's a short succinct definition and how it works... Let this be your guide for determining whether a particular Flash will meet your needs.

Can anyone suggest a specific flash for shooting models at 50mm outdoors for full body shots?

Lautermilch said:

Can anyone suggest a specific flash for shooting models at 50mm outdoors for full body shots?

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Just one, on-camera flash?

I guess I'd suggest either the SB-700 or SB-910 if you want to stay "all Nikon" with your kit. If you're open to third party flashes you might want to consider the Yongnuo 568 EXII or something from Metz.
....

Lautermilch said:

Can anyone suggest a specific flash for shooting models at 50mm outdoors for full body shots?

Click to expand...

There are many acceptable flashes, of all prices. My own notion is that LED is not among them.

Some of it depends on what you need it to do.
See Beginners Guide to Select a Hot Shoe Flash