I don't own either ( yet) but until many users have a chance to use them, it is premature to assume they will not show "much practical difference," as much as it would be premature to assume big difference favoring one or other. Obviously handles are noticable difference, also Becker is straght blade handel/ while Busse appears to have slight angle in handle. Do they have similar weight, balance, and grinded angles? Are the stells equal in their quality/performance? We can't tell this just by pictures, only experience will tell. Because they are both "big choppers" any differences- if any, should be noticable.
Martin