I've never heard of them. A benefit would be no stomach irritation. The amount of time for the drug to reach therapeutic levels in your blood is probably different. Have you tried looking them up on drugs.com or similar website?

There would also be different side effects. I've taken three different forms of Imitrex for migraine -- tablets, injections and nasal spray. The only one I could tolerate was the tablets. The side effects for the others were stronger and more than I could tolerate.