Comments
First piece of advice. Go to your local club and see what others are sailing. If you join that club it is nice to sail with/against others, be that competitive or noncompetitive. Having a boat in the same class will be much better for this. You can also pug in to lots of advice. You may find that you opt for a different model.
To some degree size matters.
Smaller boats are more toy like in appearance and also bob around more in the water. Longer hulls have a faster theoretical maximum speed. Then you need to balance transportability. All of the models you mentioned can be easily transported in a car, fully rigged. The balance between size and transportability is perhaps why the 1m class is so popular.
Robbe Rainbow 2 is 500mm long
Lesro 575 is 575mm
Odyssey is 610mm
Victoria 779mm long
I have only had experience of the Victoria. I am a happy owner.
It was easy to build for a novice (me).
It sailed well out of the box.
It has been used and abused for several years and is still going strong.
It has proved very reliable.
There is a good following and there is a racing class for this boat should you wish to compete.
There is an excellent source of info on the Victoria here
http://www.victoriarc.org/Sailing (once you have the boat) is almost free. Only need to recharge batteries.
Spares are easy for Thundertiger (but I have never needed any).
Criticisms.
It is not competitive for racing out of the box. But in fairness no boat is.
The use of hitches and special knots as shown in the instructions is a pain. I used simpler knots.
The plastic deck fittings do not glue well the first time. But this is perhaps due to the adhesion surface of the plastic. However after re gluing they are solid. I only had to re-glue 2 a third time, they have since been solid for several years, no more problems. I have seen people get carried away after they have come adrift once, and spend a fortune on stainless steel deck fittings, there is no need.
In short, I have no hesitation in recommending the Victoria.