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The Impact-Parameter dependent Color Glass Condensate (b-CGC) and Saturation(IP-Sat) dipole models incorporate key features of small-x physics propertiesand match smoothly to the perturbative QCD regime at large $Q^2$ for a given$x$. Although both models include saturation effects and depend onimpact-parameter, the former is based on the non-linear BK equation, while thelatter is based on DGLAP evolution. After confronting the models to therecently released high precision combined HERA data, we show that in bothmodels, the typical impact-parameter probed in the total $\gamma^{*}p$cross-section is about $b\approx 2\div 3\,\text{GeV}^{-1}$ and the protonsaturation scale is $Q_S<1$ GeV in HERA kinematics. We show that most featuresof inclusive DIS and exclusive diffractive data at HERA are correctlyreproduced in both models. Nevertheless, the b-CGC and the IP-Sat models givesignificantly different predictions beyond the current HERA kinematics for thestructure functions at very low x and high virtualities $Q^2$, and for theexclusive diffractive vector meson and DVCS production at high $t$.

b-CGC versus IP-Sat and high precision combined HERA data