IMHO, or IMAO, there is no such thing as the perfect e-cig out there. Every single one of them has it's pros and cons.
For a beginner, it's always best to use something that's ego style, meaning ego-t, riva, kgo, vv ego...that sort of thing. They're small, gives good battery life that will easily last a day for most beginners, easy to use, and is compatible with almost any atomizer and cartomizer out there. Whether the e-cig leaks or not will depend on what atomizer or cartomizer system you use. Most of them will leak given the wrong situation.
Personally, I find that the best beginner package is an ego style battery with a 510 connector, coupled with a filler type cartomizer of some kind. The battery lasts, and filler type cartomizers tend to be less likely to leak, and are easy to fill. These cartos are also cheap enough that you won't feel too bad about chucking them after they start reaching end-of-life. They're also cheap enough where you won't mind having 3 of them operating at the same time with 3 different flavors, if you're the type that likes to switch around through the day. An ego style battery with 510 connector is also easy to find atomizers and cartos locally, as 510 stuff seem to be the most popular here. Cost for a complete package with everything you will need plus e-liquid for a month will probably cost you less than RM200 from some local dealers
Not to say that the monster is a bad product, but I do prefer having my options open when it comes to being able to use other cartos and atties.
If you are able to, I do advise beginners who are serious about switching to e-cigs to get a good quality mod as their one and only e-cig purchase. Mods are a great investment, as long as you choose a mod that is proven, almost indestructible and performs well. It's better than buying different things to try out and end up spending more than just going straight to the mod. A good mod like an Omega, Alpha, Silver Bullet or anything from the GG range is probably gonna last your lifetime, and these types of mechanical or semi-mechanical mods tend to be ultra reliable. I've actually dropped my own mod into a kitchen sink full of water before and all I had to do was clean it out, replace the battery, and it was ready to go again. Cost for a decent mod, if bought locally, together with charger, battery, e-liquid, etc. could run you upwards of RM600 for something like and Omega, to more than RM1000 for something like a GGTS with UFS. It's a heavy investment, but it's well worth it if you are seriously into
vaping.