Can only comment on my set-up.
OEM exhaust was replaced with full Miltek but I found it absurdly quiet (seemed quieter than the OEM it had replaced).
Then had BERKS HFCs fitted and it transformed the sound of the car. Some people have commented that HFS sound "raspy" but either my ears tune that sound frequency out or it just doesn't happen on mine.
The combination of Miltek and Berks give a lovely burble at idle and a purposeful growl on full chat but still gives a very muted tone at cruising speed, no droning at all.
David