The Helix and Dome fossils are key items that first appeared in Pokemon Red and Blue. They are fossilized pokemon however they need to be ressurected to see what kind of pokemon they are. Luckily at Cinnibar Island a scientist created a machine to revive fossilized pokemon. Head to the island and go inside the building left from the Pokemon Center, go to the far right room and speak to the scientist by the big machine. He will ask you to give him the fossil give him the fossil then he will ask for you to take a walk since it's gonna be awhile. Go outside then come back in the building and speak to him again to recieve your fossil pokemon. The Helix Fossil contains Omanyte and the Dome Fossil contains Kabuto.
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Kabuto is the Dome Fossil, and Omanyte is the Helix Fossil. An easy way to remember is that a helix is a spiral, and hermit crabs, such as Omanyte, have a spiral shell.
helix, dome is better in fire red
When you clone the helix fossil later on in the game, the Helix Fossil can be regenerated into an Omanyte. The Dome fossil can be regenerated into a Kabuto.
Kabuto is in the dome fossil and Omanyte is in the helix fossil.
In all honesty, it is up to you. The Helix Fossil is an Omanyte, while the Dome Fossil is a Kabuto. Personally, I would suggest the Dome Fossil, just because I love Kabuto.