Money is only one factor out of several. In terms of functionality the order is:
Victron BMV-712 > Victron Smart Shunt > AiLi > Voltmeter > dummy lights > nothing.
In terms of cost, it is exactly the opposite.
If you are truly budget limited then pick what ever fits your budget.
However, for most of us with $20K - 500K campers, $100 is in the noise and having a better idea how things are working is probably worth the cost. Particularly with lead acid batteries who boondock, it is important to know that your batteries are actually getting fully charged, which a meter with history will tell you.
