A lead-acid battery's acid is not dangerous when using a charger or charge controller designed for lead-acid, and the battery is installed in an enclosure. They sell marine battery boxes for this purpose that are not expensive. They're just plastic. Chargers and charge controllers designed for lead-acid are legion - almost every one supports lead-acid. Much is available at retail, 24x7, at "travel centers" (truck stops) like Love's or Pilot/Flying J.
The downside to lead-acid is you must use it only in the 70-100% range (meaning only using 30% of its nameplate capacity) if you want to get the full 4-7 year life out of the battery. Dipping any deeper shortens battery life - yes, this is terrible, they are terrible batteries but they are so cheap nobody cares about their deficiencies LOL. This paragraph is talking about "Deep Cycle" lead-acid batteries. Most lead-acid batteries are optimized for engine starting and immediate recharge - they degrade rapidly in a deep cycle application.
As lithium batteries get scaled up into billion-unit production, they are actually becoming cheaper per USABLE watt-hour than lead-acid. (given that you can realistically use about 80% of a lithium's nameplate range instead of 30% lol). However that only applies to raw batteries. When you buy a retail product ("portable power station" or "solar generator"), they really rip you off, bigtime. Probably because of the huge return rate from angry customers who actually believed their marketing claims LOL.
However, raw lithium batteries, while affordable per usable watt, are difficult to work with. You are responsible for implementing three systems: a cell equalizer, a BMS to protect the battery from overcharge or over-discharge or cold-charge that would make it catch fire, and a solar charge controller that understands lithium. If you don't get that stuff right, the battery can catch on fire. Also, there are complications with charging the battery below 0°C.
Worth it? Depends on the size of the pack I suppose. You really need to learn more about how to think about battery sizing. You're on the right track but keep skilling up. Skills last a lifetime, and a lot of stuff is happening in battery tech. You'll use it.