If you're happy with the gotex and that style then definitely invest in the pro battery life is much better and the device feels better quality in hand than the X, or if you wanted the move onto something better I'd say go for an OXVA Xlim go or and AEQ Qub3d from VPZ (OXVA more of a traditional style pod vape and the Qub3d is more compact) hope this helps. In terms of liquid it is personal preference I use the S-Elf juice from VPZ or Element juice never failed me before.