AGM battery
The absorbent glass mat battery is definitely the best of the two batteries discussed. This may be related to cheaper options in the VRLA category.
This may also be related to the fact that AGM batteries are excellent when they require a lot of amps. They use a typical battery charger or alternator to charge, instead of using special equipment.
As long as it remains charged and maintained, AGM batteries can provide a very long service life. AGM batteries are ideal for applications that require starter power and can handle vibrations, such as ATVs and motorcycles.
Gel battery
For the purpose of full disclosure, gel batteries do tend to cost more, and each battery size cannot provide the same power level as the Sealed AGM Battery. They also have some charging issues.
For example, they are charged in a very specific way and can only be charged with a dedicated charger. Otherwise, the battery will be depleted prematurely. You can use an alternator to charge the battery, but you need to install a regulator. Reassured Sealed Deep Cycle Battery manufacturers are studying this technology, and these problems have become problems in history.
Having said that, gel batteries are excellent for slow discharge applications. Gel batteries are very suitable for applications such as battery-powered wheelchairs, golf carts, and other applications that require constant power rather than burst power.
Which battery wins?
The true winner of the battery debate depends on your personal needs and battery application. As long as you maintain the battery correctly and make decisions based solely on what the battery needs to do, the real winner of the debate is you.