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Hi Stu,
Either of those power supplies will be OK for what you need, all power supplies these days are switch mode power supplies (SMPS), including PC's, TV's etc.
The older style Linear power supplies disappeared in the 1990's because the transformers were heavy and bulky and the filter capacitors were also large and heavy to get rid of the 50Hz/100Hz ripple. THE SMPS power supplies operate at about 100Khz and therefore the filter capacitors are quite small.
The 5% current tolerance means that while advertised as a 20A supply it may provide a max of 19A to 21Amps.
The 150mV ripple is nothing to be concerned about and would be the same for the cheaper unit.
Cheers
Bill
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