SAX-125.4 or SAX-100.4 for infinitiys?

[cha0 10+ year member]

Which would I be better off with for these guys:

Infinity Reference X REF-9603ix 6"x9" 3-way car speaker at Crutchfield.com

Im finding the 100.4 for like $100 less then the 125.4 so I was wondering if it was worth the difference? This is my first time amping 6x9s. Thanks guys.

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[GavinVoy 10+ year member]

the 100.4 is cheaper, but the 125.4 is newer, more power, smaller foot print, fused at less amp which makes me believe it is more efficient. I have had the 100 for about 4 years now and it is great, never had a problem. but i am about to install the 125 this weekend.