Ya, not that they had to, but I think they did the eyebrow thing partly to make him seem more machine and stand out from people or whatever. It was kinda creepy looking so in that regard it was effective, but I'm not a fan.
I love T2 over T1, but I got exposed to Terminator through edited for TV when I was young, and T2 was hot at the time so they aired, took a few years before T1 was in demand enough or whatever for them to air that on edited TV, so for years T2 had defined Terminator for me, I came to love it, and also it was current with the time I was living in, so the 80's old look of things stood out to me in T1, mostly Sarah's look, and I loved Arnold's spiked hair in T2 so his weird hair for a large part of T1 just looked odd to me. I also like the more epic feeling music in T2 over T1.