Unfortunately, the only way to know is to buy the WE tube and try it. Even if nine out of ten prefer it, personal taste or system synergy may put you in that minority group. If you do like the WE tube, it should be your primary tube; why not enjoy the best first, and why waste the 5-year warranty sitting in the closet?
By the way, I’ve heard the Elekit amp and it sounds very good for not much money. On top of thar, you get the satisfaction from building it yourself. Also, an itch to upgrade can be satisfied by buying and installing upgraded parts.