You need to ask yourself what YOU want from the product you'll choose.
Do you want a strong UV gel that can be used over tips, sculptured and NNO?
Do you want a non yellowing product (of course you do) that won't break down over time?
Do you want a versatile product that comes in colours as well as regular gel colours?
If you decide to choose a soak off versus a file off then ask yourself why you need those particular features, I can guarantee you that you won't need to soak off as much as you think you will!
I use Brisa gel by CND, it's hypoallergenic, it doesn't contain the 3 most commonly known irritants which are formaldehyde, gluteraldehyde and acrylates, that has to be a plus in anyone's book! They offer longevity of product, strength of product, colour, the oportunity to custom blend colours (to hide nail biters nail plates) and satisfaction amongst the technicians who use the products...
I'm a very happy Brisa tech and proud of it