the trapped ion model is much smaller, which might cause one to think that the cost of production would be lower as well, due to lower raw material cost.
qubits per dollar seems an appropriate initial metric to optimise for
and a neutral atom model as well, pictured here. i think 500 raw qubits for this but canโt remember how that equated to logical qubits; it was definitely an order of magnitude lower than the trapped ion model, for which the phrase โtwo to oneโ was used on the upper end.