Of course there are differences but the difference between my top maker and my regular Bespoke work is not a chasm like say an MTM from a Savile Row house compared to its bespoke work, it never has been.
This is also reflected in pricing as well, these days a David Reeves bespoke suit goes for about 3000 and top maker at 4000
Differences are things like, a basted fitting with top maker as standard, finer hand made buttonholes (around 60 stitches compared to 30 per buttonhole), hand padded lapel, access to higher end linings and cloths as standard and of course it is made by an individual tailor locally rather than a local shop.
What can blur the lines significantly though are differences in pricing for cloths, so you could choose a regular bespoke suit and have it made out of a very expensive cloth and then straight away it has a higher price tag than the top maker, does that make sense?
I can certainly see in the not too distant future though that there may not be two different streams, as just one person I am already doing 12 hour days six days a week, I have about 40 suits in circulation at any given time now and I get more new and repeat clients in every day, so with that workload pricing has to go up (and it is). Unless I hire people and expand in a conventional sense I may just eventually end up as a very expensive under the radar luxury maker, I'm certainly at a fork in the road right now but its an exciting place to be.