TBH I am impressed with the Zenith - have both 2ml & 4ml 24mm versions
(might get a newer D22 at some point as I have a short 22mm thick sausage battery - but enough of my personal life)
Seems to work very well with any mod/battery with a 1.6 ohm coil and 10~12w
(there is the 0.8 ohm coil also & new 0.5 plexus mesh option)
Drop a 2ml 24mm Zenith onto a pebble - very very slight overhang mainly at front by front/fire button
(D22 = no over hang, but a smidge of overhang at front, just guides your finger to button imho)
Idiot proof fill system, easy coil change and just works without leak risk like Nautilus 2
(OK new Nautilus 2 has slip lid but tbh still think Zenith wins overall)
My own Nautilus 2 seemed to run hot on a few mods, eventually finding one that ran less hot
(guess some mods Watts/Volts default settings vary a little but often the N2 was cooking/hot drip tip after a while)
I'd suggest maybe a 9mg liquid perhaps, 12mg might be ok if a very tight vape now & then
but think you might be vaping say little & often and so don't want to get too high on higher nicotine
(depends on how you vape & your juice etc.... but go easy is all I'm saying)
Yes you can go RTA but if using this MTL stealth kit just for work then 5 std zenith coils for say £8 won't break the bank
(plexus are a bit more perhaps)
Pebble works well, bit heavier than say eleaf mini - which the eleaf mini is only good for 20mm tanks or less on 1.6+ ohm coils
On a tight budget ????
NB: not tried these but this is a silly price for a togo kit £9:99:
https://www.shopec.co.uk/starter-kits/kanger-togo-mini
or some RTA tanks - say Griffin 25 mini for £9:99
(not a MTL but cheap as chips)
https://www.shopec.co.uk/tanks-and-coils/mod-tanks
As stated not used them myself, but have been very tempted to place a £30 order for free shipping
(I really need to stop looking for yet more stuff - thought vaping was supposed to save money not spend more on stuff)
Reason I said about Zenith is coz it is agro free and does what I need it to
Than mess about getting the wicking completely sussed that works for certain tanks
or re-wick if leaks/dry hits - I'm still learning/adjusting my wicking technique btw
(aren't most of us)
I never went out with the N2 coz if it needed refilling I ran the risk of coil loosening and pissing everywhere
So kept the Nautalus 2 at home (also ran a bit too hot like I said on some/most mods)
Yeah some good MTL RTA's out now, but if you are just gonna MTL at times a pre-built coil might work ok
At home you can DTL bigger clouds or consider a MTL RTA tank to coil & wick at your leisure so to speak
hope some of this helps