A couple years ago, I had 2 monitors but the computer itself was SOOO slow and I couldn't play Minecraft once I bought it, but my dad let me use his laptop and I am pretty much the only one who uses it now because he didn't really use it at all.
1 decent fast laptop VS 2 monitors with a super super slow computer:
A fast anything would be better than a slow thing, even with 30 monitors.