HI Amir,
The alternative, which I have taken, is to have multiple turntables. Why? Because I can.
The multiple arm alternative was really not possible for me because of the turntables I owned.
I had the arms for three turntables. All I lacked was the third turntable. Since I wanted to set up one as a "utility" turntable, one that I would use strictly for auditioning new/unheard used records, I bought a really nice Thorens TD125 Mk1 and mounted a Graham 2.2 Deluxe and an Audio Technica OC9/2 on it. The logic here is this will save my "good" cartridges from that nasty work. It worked out well. The Thorens sounds good. Not hard to listen to at all which is nice since I spend a lot of hours auditioning these unknown records.
I'm not suggesting that this is the best way to go. Three turntables are unhandy in that they take up a lot of space and you need to support them in the system. It happens that I had an Aesthetix Rhea phono preamp that could support three turntables. So, the system problem is taken care of. I had the space as well as an extra Lead Balloon stand.
The other two turntables each have high end cartridges that have different strengths and weaknesses. One is especially good at jazz and vocals and the other is good at classical and large pipe organs. That's how I use them.
But, I'm the first to admit that my approach is an example of wretched excess. I could live just fine with one. But, what fun is that?
Sparky