This is a "Do as I say, not as I do post:"
I have this problem whereby I buy too many pairs of boots and shoes. It is made worse by my desire to try different brands.
Especially over the Internet, it is nearly impossible to know what is the ideal size to get in a pair of footwear. Then, even if one has found the ideal size, it is hard to know whether that pair will turn out to be super comfortable or completely not comfortable until they are well broken-in--unless you are somebody who finds everything that is about the right size feels comfortable for you.
Since you have White's, sticking with Whites, rather than switching to Wesco, would be, by far, the safest was to ensure you didn't end up with something uncomfortable. I swear I don't get any rewards for endorsing Kyle at BakerShoe.com, but he is a good guy and sells White's, Nick's, and Wescos. He would be in a good position to tell you about the relative benefits of the different brands and help with sizing between them. Also, his prices are lower than going directly.
I thin the one good reason to try Wesco, if you are happy with White's, would be because Wesco is famous for their Engineer and other pull-on boots, so they might do a better job of them than White's--I don't know.
One of the Wesco lace-up models, the Highliner, comes with a half-slip in the stock boot, so you might be able to try one on before committing to it. There really is no substitute for trying on boot before buying them.
Anyway, I say all this, but I am full of shit...I ordered Wesco lace-up, despite being happy with my White's, Nick's, and Viberg's. I tried on some stock Wesco Bosses and liked them, but they didn't have exactly my right size, and I don't ride a motorcycle...so ordered the lace-ups. I know I was just looking for trouble.