Okay, I have been looking for an easy explanation for an hour now, but can’t find a straight enough answer.
What is the advantage of having more wattage when the RPM are the same? The AMB 1050 has got 1050 Watt and 3500 - 25000 RPM, the AMB 1400 has got, surprise, 1400 Watt and 3500 - 25000 RPM. Since those numbers are the same, where is the advantage in having more wattage (or, I think, HP for you Americans)?
Just like having more power available for a car. Or, let’s say an off-road vehicle. A 100HP and a 150 hp off road vehicle, both can go through the same course, but one is going to be able to deal with obstacles better and slow down less.
For your spindles, power translates into available chip load. The one with more power is going to be able to maintain the same RPM when cutting through harder materials, or taking a bigger bite. It means that it is capable of a wider range of speeds and feeds and depth of cut. This means that it is a little less picky about the CAM, and can deal with a wider range of application.
Now let’s go back to the off-road vehicles. If they are both the same chassis and wheel type, they’re still going to have similar limitations, both will get stopped by the same high boulder or deep trench. The same with your CNC. If you upgrade from the 1050W to the 1400W spindle, the limitation might be the CNC machine flexing, rather than the spindle not being able to cut, so in those cases, the more capable spindle won’t make the machine more rigid.
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Thanks. 
Elegant explanation. I think that is going to get used a lot more than my “jet engine in a VW bug” analogy.
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(Still gonna buy the 1400 though if I buy a new one. These 70€ don’t make the difference… It has got ER20 collets as well so I could feed it with the heavy endmills.)
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