Vaping is a little like sport, you must find the equipment (vaping device and chemical combination of the e-liquid) which suits you the best. Each case is different, so there are no universal recommendations. Flavours, nicotine contents, box, model, … everything is a question of the person, of taste and vaping comfort.
One must try several types of products to find one that suits you. Please note that the right association is not necessarily a guarantee of success.
Vaping is not a “magic” solution. There is a difference between owning an electronic cigarette and being a vaper. The real key factor to success in stopping smoking is the motivation associated with suitable equipment!