Battery Recommendation for SN

I use an optima red top in my 92 SN. Last one lasted 8 years. New one is already 3 years old. Always on trickle when not using.
I like the battery box to be clean with no chemicals leaking etc...thats why the gel battery

I have a 1990 Correct Craft Ski Nautique and need a new Battery. The boat lives at an Idaho lake at 6000 feet for the summer. I don't recall what battery I had in the past, but that last one lasted 10 years with no problems, I would remove it from the boat in the fall and trickle charge it every 6 weeks or so in my heated garage until recommissioning in the springtime. A year ago I replaced the battery with an Interstate MTP85, and this battery lasted less than a year, it no longer is holding a charge. The battery compartment on the Nautique is of limited height, so wondering if folks with similar boats could recommend a Battery ? Thanks and cheers, John