Race batteries - what make?

[Elderly]

After many years my 'Racetech' branded battery needs replacing
and they are no longer made.

Does anybody have any experience on whether Varley Red Top,
or Odyssey Extreme have any advantages/disadvantages over each other?

Mods. if this enquiry is in the wrong place ...............

[Elderly]

Thanks for the ideas;
I did consider Lithium but the equivalent dimensioned 25AH I needed was
hugely expensive.
And I'm afraid that Tanya don't have the size I need .