As someone that wears winged liner on a daily basis, it's important to me to have a good quality gel liner. For the past few years, I have always used 'Maybelline Eye Studio Liner' which I have found to be very good quality and as such have had no reason to use anything else. However, I recently bought the 'Rimmel Scandaleyes Gel Liner' due to there being a special offer on Rimmel products and my being out of my usual liner. I've been using this liner for a few weeks now and thought I'd share my thoughts on how it compares to my usual Maybelline one.
I'll start with something some people may find a bit trivial but I still think it's worth mentioning - the packaging. Both of these liners come in a little pot, however I find the Rimmel pot to be a lot more plastic-y and cheap feeling in comparison to the Maybelline pot, which seems to be made of glass. Both liners also come with brushes which are very similar and may be useful to some, although I prefer to use an angled brush. These brushes are not incorporated into the pot as with some eyeliners which, in my experience, leads to the gel liner drying up more quickly (perhaps more air gets to it?). This is also a positive due to the fact that this means the brushes are not inconveniently small and difficult to hold.
Both of these liners claim to be waterproof and last up to 24 hours. I have not found this to be the case with both being a little worn away at the inner and outer corners at the end of my school day (so around 9 hours after application). However, this is still pretty long lasting and despite being a bit worn away, these liners are smudge proof. However, I find that the Rimmel liner tends to dry up throughout the day until it begins to flake off and Maybelline Eye Studio is the longer lasting of these two. Whilst it prevents you from ending up with the panda look with smudged makeup under your yes, this staying power can be a downside. If you have only just applied either of these eyeliners, they are not going to come off so if you make a mistake, correct it before it dries. They are both fairly waterproof, although don't have unrealistic expectations - waterproof makeup is never completely waterproof. Don't expect to be able to have a shower and still have perfect makeup.
In terms of application, these liners both glide very smoothly on the lid and are very pigmented and opaque. However, I have found that more is needed of the Rimmel liner, perhaps due to a thicker formula, meaning you are using more product and thus are likely to run out quicker that one would with the Maybelline liner. This thicker formula also means that the Rimmel liner feels slightly heavier on the lid and could possibly be the cause of its tendency to flake off throughout the day.
Overall, Maybelline Eye Studio is still my favourite liner and is certainly the better of the two, although I was still impressed by the Rimmel Scandeleyes liner. Maybelline Eye Studio is only £1 more expensive at £7.99 and you are arguably getting more for your money due to the fact that, as previously mentioned, less is needed at a time, meaning it will last longer.