Difference between 2 surge protectors?

NEITHER of the surge protectors you list here will protect your TT from the biggest cause of damage-- LOW VOLTAGE which is much more common than electrical surges.. I bought a new TT last year and purchased a 30 amp surge protector for about $80 that I thought was what I needed. I have since learned from this site as well as hundreds of comments on Amazon that low voltage is very common in campgrounds due to age of pedestals, heavy usage in peaks, and bad wiring and these low voltage periods can shorten the life substantially or burn out RV A/C units, microwaves and electronic TV's and stereos. You need an electrical management system, either portable that plugs in at pedestal or hard wired inside your TT. The very best one from hundreds of comments from customers seems to be the American made Progressive Industries 30 or 50 amp models which are only ones with a Lifetime warranty! I am getting a Progressive PT30C for Christmas to replace my surge protector. They have digital readouts on volts, amps, cycles and will automatically turn off your RV power if it goes UNDER or OVER the safe limits and then will automatically reset when it is safe. They are not cheap-- The one I am getting is $259 on Amazon, but with the cost of any one of the appliances it protects in the thousands of $.. It seems like a necessity to me if you plan to hookup to CG electric... Check out the hundreds of customer comments on Amazon on the Progressive PT30C with its 5 star rating... I think you will rethink buying just a surge protector which only protects from over voltage spikes that happen way less than the under voltage periods.