AGM battery for solar panels?

Not an expert but I like to think I've picked up a couple things over time. Some batteries have the standard lead knob to clamp your battery cable to like your vehicle battery. Some that are dedicated to permanent installations have threaded studs to connect your cables to. Some batteries have both types of connections. I have heard for a mobile application, you want a battery designed for a vehicle that can take the shock of the road over time. An AGM is inherently more forgiving than a wet cell because the glass matts won't allow any debris in the battery cells to slosh up and cause an internal cell short. Look for the weight of the battery you purchase. A heavier weight may translate into more lead in the cells. For the same AH rating, go with the heavier battery. For solar / battery size matching, a rule of thumb is to have as many watts as there are amps battery current rating. I would take it a step farther since in the real world, you may see your solar panels deliver up to 70% of their rated output. For example if you had 300 amp hours battery you would want 300 watts solar. Since you only realize 70% of that 300 watts in the real world application you would actually realize 210 watts. If you install 400 watts of solar you would realize a 70% amount of 280 watts. So 400 watts rated solar is a better match for 300 AH battery rated output.
Remember to check in the Truck Camper University section. Others have done this before and a lot of information is posted there.