As someone that's only had boge cartos, can you explain what makes Smok cartos better? Both in general and for thicker juices?
My experience has been that Smok cartos are just better than Boges.
What I don't like about Boges...
The Boges that I have used, have had a very dense filler material, so dense that it doesn't absorb juice very well, if at all; Like pouring water on a brick. If you are patient enough, and it does take time, you can eventually get them to accept the juice, to some extent anyway, I have never felt that I got them fully saturated, which is what you are trying to accomplish. When vaping Boge cartos, I have found that you must constantly keep topping them off so as to prevent the filler from being scorched due to lack of juice. Just way too much hassle.
What I like about Smoks...
The complete opposite of what I have said above. The filler material is much more accepting of the juice; much easier to fully saturate. And, since I know that the carto is fully saturated, I don't have to worry about topping-off the carto with anywhere near the frequency as with the Boges. I have never scorched/burned a Smok carto by letting it accidentally run low on juice. Whereas I have had Boge cartos burn for this very reason.
Between the two, I have found no noticeable difference in taste or build quality.
Regarding Smok or Boge and thicker juices. I like 100% VG juice, or near that, which is typically regarded as being thicker than PG juices. When trying to fill a Boge carto with thick juice you can count on being there quite awhile, watching it puddle on top of the filler and never being absorbed. With a Smok carto it soaks in very quickly. In filling two cartos, one Boge, one Smok, of standard size and with the same juice from the same bottle, I would typically be able to get the Boge to accept 24 to 30 drops, whereas the Smok will typically accept from 36 to 40 drops. With the Boge I know that it is not really saturated and therefore will require more refilling to prevent burning. With the Smok I know that it is completely saturated and I can vape it without fear of burning for a much longer period.