Yes, most fossils in general are good choices as a part of your team, as they are all only half rock, and kabutops and omastar are good water pokemon in general if that's what you need. They have really good variety of moves too so they're generally worth the wait and somewhat long train.
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helix, dome is better in fire red
Kabuto is in the dome fossil and Omanyte is in the helix fossil.
If you choose the Helix Fossil it can be revived into an omanyte. The Dome Fossil can be revived into a kabuto. I suggest you pick based on what pokemon you like better.
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.
There is no ar code to get omantye in fire red. In Mt. Moon you will find a scientist and he will give you a choice of two fossils, the helix fossil or the dome fossil. if you want Kabuto choose the dome fossil, and if you want omantye choose the Helix Fossil.