The comparison I do is not base on market penetration, is the quality of the HU, if base on local penetration also, Alpine should be not on the no1 most of the HUs sold. As the price is not for beginner or people that have alot of budget to spend to. Like our thread starter, he only want budget of rm400 and me depends on situation.
Anyway they just want maximum profit return with minimum cost and R&D, so they will try to sacrifice 4V output to 2V or 2.2V. Anyway the 2V diff does not make much diff to amp, only 4V the amp gain can set lower, thus reduce noise or airplane sound, but if we do the amp grounding proerly it should be not much problem. If just because of 2V extra I have pay extra few hundred I don't think it is a wise way. Unless not going to add amp, then can think of Alpine. If adding amp, have to think what amp going to be used. If using cheap range then is no point already as HU output great but amp output to speaker no good also wasted. Just my opinion.