Replacement Battery for Autosleeper Harmony

Hi
I have a 2002 Autosleeper Harmony built on a Peugeot Boxer 2.0 Diesel base. The reg no is ST02LYG. 
The van's battery has died, causing me to be rescued twice in one day! The label on the battery says it is a 019, Voltage 12V, CCA SAE 800 amps; AH (20h) 90 amps.
However, when I put my reg into battery supply websites, it says it should be a 096 type battery, which seems to be slightly smaller size wise and performance wise.
Should I replace with a 019, or 096? 019 seem to be bit more expensive, but would they maybe last longer?

Thanks for advice.

Pat

Putting your registration into Tayna Batteries website (numerous recommendations on here) comes up with the 019, 096 is not given as an option. With batteries, the bigger the better if you can fit it which obviously you can.

OK, thanks for that. Almost every other one comes up with 096!

Turns out battery is fine, just a loose connection, found on closer inspection. Got checked at local garage, and confirmed OK. Glad didn't order a new one!