Avisynth's bilinear kernel is expanded, compared to the norm, it uses just as many pixels as bicubic, so it will never be equivelent to GaussResize, or a box filter like standard bilinear would.
Anyway, to get closer to the original topic, most of the time I would now recommend using BlackmanResize(width, height, taps=5). The blackman windowing function is good enough that you can commonly get away with a higher number of taps then avisynth's other interpolators, which is good because it really needs them. BlackmanResize looks a bit more "neutral" then spline or lanczos, but occasionally it will let some aliasing through, especially with taps of 3 or less.
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