Hi and welcome. It's really hard to say which is "better" everyone kind of finds their own sweet spot with vaping. There are many folks who start with a MTL vape and like it and stay with that type of vape. It does have advantages (whether you prefer it or not) such as consuming less juice and requiring less wattage, also easier to "stealth" vape if you want/need that kind of thing... (I'm not recommending that per se, it's just one advantage.)
Other vapers found that DL suited them far better, some folks vaped a long time while still dual using and then found for them DL was what helped them fully quit.
It's completely subjective, so if you can't get your hands on a few different vapes, well , you're going to have to pick one and see how you like it. MTL can be cheaper to start (at times) depending on what you select, and it's more suited (probably) to an internal battery mod so if you are unsure a moderately decent pen style MTL vape MAY be the way to go.
I usually these days, TBH, if someone has NO idea what they want, suggest an inexpensive one or two battery mod without too many bells and whistles, and a sub0hm tank (DL) and a MTL tank to see which you will like better. . If you prefer DL, a decent MTL tank can run you as little as 20ish dollars. If you don't love MTL, well you will have a backup tank and will have quickly discovered your "preferred vape" and if DL, well then you have the MTL for a backup even if it may be your preferred thing.
This gets considerably more involved (and to be fair more costly) as you will need removable batteries and a charger to go with it.. I often recommend the Eleaf invoke for this experiment for a box mod because it is the smallest and lightest 2 battery mod I know of, and it won't break the bank, it's easy to operate, not a ton of bells and whistles, and fairly sturdy construction despite its size.
I do this because I feel bad recommending one style over the other and "getting it wrong" to a new vaper. You absolutely DO NOT have to do things that way, and you could just start with whatever appeals to you most.
Best of luck and welcome. Oh and if you decide to go with the external removable battery here's some info on battery safety (you don't have to read it all immediately) but if and when you decide to get into batteries, well, it's useful information.
https://www.e-cigarette-forum.com/blogs/mooch.256958/
https://www.e-cigarette-forum.com/blog-entry/baditudes-blogs.7609/
Welcome to ECF and I hope it goes well for you,
