well, this is my take on the subject ...
Banner are budget batteries and getting 3 years out of one is actually not that bad in reality. But you can do a lot better!
Some folk rave about the Powerframe Varta/Bosch Batteries. Good for them

not for me
What options are there?
Lithium is obviously the most advanced choice and there are numerous advantages, of which Philip has touched on. But you do need to fork out for the initial investment and also likely add some advanced
battery management/monitoring (a basic voltmeter won't cut it with Lithium) and maybe update your charging system.
If you go Lithium, I have not seen a better value product than the Poweroad Lithiums that Alpha-Batteries will have in before Christmas. You can get cheaper by building your own of course, but if someone was into that, they wouldn't be asking a "what
battery" type question in the first place, so lets forget the DIY option!
An option which I personally think is very good is the one I have in my Campervan (and got from Geeky Philip as it happens) ...
Lead-Carbon. A variation on the Lead Acid AGM batteries and while they don't have the same life cycle count as Lithiums, they could well outlive many of us in normal use (Lead Carbon batteries tend to have a cycle count in the thousands).
Using Alpha Batteries as a example (I tend to look at their range as they manage to have the best prices around), they have a new Lead Carbon
battery arriving soon -
https://www.alpha-batteries.co.uk/1...ad-carbon-ultra-deep-cycle-battery-dc12-100c/
What I like about this
battery is that you could use this genuinely as a drop-in replacement for a standard
battery without the need for extra monitoring. It also has a lower charge voltage requirement than typical AGM batteries so may allow you to fit it without the absolute need to upgrade your chargers.
If you are tight on space and weight, Lithium is the way to go, but you do need to make sure it is installed right with suitable associated periphrals (chargers, monitors)
If you are ok for space and weight, I would be very tempted by the Lead-Carbons as - IMO - as a DIY install, they offer the least hassle at a significantly better initial cost than Lithiums.
My own plans are to install Lithiums in my Motorhome, but that is because of both space and weight limits. If I had the spare payload (like in my Camper), I would stay Lead-Carbon and save the money (even though I have chargers and monitoring suitable for either).
Final note. The best way to get the best service life from your batteries is to install more than you need!
If you think a 100Ah
Battery will suit you fine, then installing 2 x 100Ah Batteries will stress the batteries a lot less, and they will last probably more than twice as long and also give you the extra power reserve on the occasions you could use it.