I like lots of capacitance on my supply rails, but this contributes to slow Vcc rise time on power-up. So far, I've had no reasonable success with SMPS or "weak" linear power supplies. When I use a linear supply with 100x the requisite capacity, I get a nice, solid behavior every time. When I use a commercial SMPS of 100x the requisite capacity, I have marginal reliability.
Everything here runs off professionally made SMPS'es and no such problems are known. The Winbond and Phi ARGH NXP p89C chips run directly off a SMPS, the SILabs and P89LPC chips run off a LDO that follow the SMPS. As to the "100x the requisite capacity" one case the SMPS provide less than 150% of the "requisite capacity" again no problem. I, again believe that the issue is not the power supply but a proper reset, and - possibly - proper decoupling.
Erik