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If you look at something at 100X in the Tasco and 100X in the Saxon, the image will be the same size.
As noted earlier, because the Saxon has a longer focal length each eyepiece will produce a little higher magnification. This has nothing to do with the aperture.
Where aperture matters is when going to higher magnification on bright objects or in the ability to see dim objects.
Your 60mm scope probably runs out of light North of 100X and around 120 you are going about as high as that 60 mm can go even on bright objects. Where the Saxon will handle 300X if the atmospheric conditions, the seeing, is favorable.
I am a big fan of barlows. A 2X barlow will turn that 25mm and 10 mm into 25, 12.5, 10 and 5mm equivalents. If the barlow is doing its job you should not see a lot of difference between 5 mm Plossl and a 10 mm Plossl in a 2X barlow.
In fact the 10 mm plossl in the 2X barlow will have much greater and much more comfortable eye relief than a 5 mm plossl which has almost none.
I am a big fan of barlows. I use a 2X with my Orion XT8i and a 3X with my Meade ETX 80.
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