Glucometers are clinical devices so whatever you buy will meet a required standard, which is called ISO 15197:2013. If you want to feel confident make sure that is listed in the description or on the box.
All glucometers need access to your blood, though, whether worn continuously or by you drawing it as required. If you are not at risk of hypos, by taking Gliclazide or insulin, then it is not worth the much greater cost of continuous monitoring as you will need to get used to inserting something into your skin either way.
Some meters claim greater levels of accuracy, but they are all accurate enough that it is not worth paying extra for greater accuracy. And cost tends to determine the features they offer instead anyway, though the real cost of a standard device is the test strips. They are not reusable and each device needs their own particular types so you cannot shop around. A free meter with expensive strips will quickly end up costing you more than a moderately priced meter with cheaper strips. So unless there are features you need, it is better to pick what to buy based on the cost of the strips.
Lancets tend to be universal though, so for those you can shop around and if you do not like the lancing device that comes with a meter you can change. The TRUEdraw, which comes with TRUEyou and TRUE METRIX but you can buy on its own in Boots, is gentler and smoother than the one with my current meter.
But the pricking is something you just have to get used to use one. If you follow the advice to do it properly it can be painless to the point of not even noticing it. The needle only quickly flicks at your finger as it only needs to draw a very small amount of blood. It is not like an injection where it has to go deep inside or stay there for any length of time.
Though a common feature you may want to look for is "alternative site testing." It still requires drawing blood in the same way, but it will take it from your arm where there are less nerve endings so you are less likely to feel anything. But the results are also less accurate, which is why fingertips are normally used.