Your not wrong Ed just adding my point. It's all about choice.
true mate true..
what i will say about sigma is
in my honest opinion
1.they are built better than rubi
2.they are more functional than a ts cutter or a tx cutter
3.they are more cost effective (ie price and cost of replacement wheels)
so if you were brought up using sigma then i can totally see why you cant look past them..
i do like them and as i have always said they are pound for pound the best tile cutters out there but i just and only just prefer using a ts 40 and a tx 700 over say a 3g/sigma6 and a 3c but i would definately have the 3ek/3em over the rubi tx1200 all day long..
i think a tiler should use whatever they feel is right for the job...a joiner will use festool, makita, or dewalt. its horses for courses/tasks so there no reason why a tiler cant have a sigma for one thing, a rubi for another or a montolit for something else....
the best tile cutter is the one you are happy with :0)