We have a concrete cistern, I am very satisfied with it. I cannot say anything about the costs (was included in the house construction).
I would always recommend a cistern with overflow to infiltration for water demand (which is present here in the garden) (so no infiltration shaft, as some offer). The infiltration can then be carried out, for example, using a soakaway. And if you are doing earthworks for the cistern anyway, the infiltration does no harm (so no overflow into chargeable wastewater).
If the water is only used in the garden, filters or other special measures on the inlet are in my opinion not necessary. It looks different if used in the house.
I can also say something about the pump. There are two options: submersible pump or (self-priming) pump above ground outside the cistern. In both cases I recommend a floating suction to always draw the cleanest possible water. We have an external pump, a so-called household water automatic. When you open the faucet (the outlet) on the pressure side, the pump starts automatically and delivers water. It doesn't get more convenient than that.
Installation briefly: Floating suction; pressure-resistant suction hose, pump, pressure hose, outlet. Specifically, we have a permanently installed suction hose from the cistern to the garage (core drilling), there the connection to the pump using a "Gardena" connector. The pressure hose goes out through the same hole again and ends at a faucet mounted "at working height" on a post. In winter I disconnect the connections and empty the pump. That's it. Of course, any branching is possible on the pressure side. (Select pump delivery height and flow rate accordingly).