sigma-delta is relatively simple and widely used; have integration nature, giving very high accuracy and noise suppression, what is important in practically all sensing aplications; have big flexibility in relation to programming of (resolution/conversion_time) by simple exchange of digital portion only; first and second order of sigma-delta (that enough for you case) are unconditionally stable and don't require time consuming stability investigations,- you have to provide choice of only some coefficients, guaranting absence of integrator saturation; ...