I think it's gotten better over time.
It's in order of CVVC, Arpasing V1, Arpasing british reclist and Arpasing full reclist.
The last sample has the tone I have always been going for tbh, but I do like the tone of the second from last.
The main differences are how they've been recorded. The lesson I've learnt is to be more organised with how your voicebank is recorded. My CVVC was recorded in audacity and I was making up things as I went along. Since no CVVC already catered for british english, I used CZ's phonemes and just tweaked them to my liking.
I personally have come to a final conclusion that you can make anything work with some workarounds, like with arpasing, I used ow for my oa phoneme (again, not to be mistaken with ao), since that wasn't part of arpasing, and then for my ow sound I used an [ah uw] transition.

I plan to make a VCV english voicebank at some point, or an improved CVVC. Just so that there's variety.
Though Arpasing will still be my goto since it's easy to record, easy to use, and sounds great anyway.

UTAU comparison (CVVC, Arpasing V1, Arpasing british reclist, Arpasing full reclist)

MOVED TO: @hitcoder-vox
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i make music but that shit goes on my youtube channel.
I am the dev, voicer and manager of Tempest Ōkaminoto.
SONiKA is my favorite Vocaloid.
I love and respect all UTAULoids and will support anyone who is passionate with their UTAU endeavours.

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UTAU comparison (CVVC, Arpasing V1, Arpasing british reclist, Arpasing full reclist)

HitCoder (moved, check bio)