I have seen a few built, and of them the one I'm planning to buy myself is the Mick Reeves 1/6 scale kit.

I guess it depends on your requirements. The Topflite is possibly the best flying (I haven't flown one but they do compromise on scale looks for flying qualities - I have the Thunderbolt and Mustang and they are compromised in many areas for forgiving handling). If I was given a Topflite kit I'd happily build it and fly it, but I don't think I'd want to spend much overall on it - not because it's bad in any way, just because I'd rather spend the money on a more accurate Spit since the word "Pedant" doesn't even begin to describe me .

On the subject purely of looks, I suppose it depends how well you know Spitfires? If you know Spitfires well then many kits have "features" which really jump out. The Spitfire is a shape which doesn't tolerate being changed.

It's hard to compare kits without bashing them (at least I find that anyway) so I apologise in advance for a seemingly negative tone, but if we go on the basis on taking a perfect scale Spitfire replica and noting all the deviations from scale then I guess we'd have something like:

Topflite: Canopy too small, nose wrong shape, tail surfaces too big, undercarriage set too far apart, belly scallops omitted.

Yellow: Belly scallops omitted (possibly more? that's all I know about)

Mick Reeves: The most accurate as far as I'm aware, but the wooden fuselage builts very tail heavy and even the new epoxy glass fuselages are still a lot of work - probably the toughest build

Pica: Undercarriage too far apart, and uses completely wrong geometry, folding straight out in front of the main spar instead of folding rearwards with rake and pintle on the retract units. It's also built from 1/4" balsa sheet sides so it's flat sided in section and not eliptical sectioned as per the real thing. The overall outline isn't too bad apparently, but the nose is too long by almost an inch which spoils the proportions a bit and I believe it has a flat belly too.

Then there are the options of just buying scale plans and laser cut parts, such as Brian Taylor's offerings, which are pretty much bang on the money scale wise but challenging builds too.

I'd be happy to receive input from others about Spitfire kits though, and am happy to be corrected anywhere that appears wrong.

None of the kits really look that bad so they'd all make something that looks like a Spitfire in the air. Your choice I guess will depend upon the effort and money you want to expend on it and what you judge to be good enough The Topflite ones benefit from quite possibly the best instruction manuals going which is great for newcomers to fairly complex builds, and the Mick Reeves and Brian Taylor offerings are IMO the best representations of Spitfires (and I know people with both and they do fly very well also ). Infact I know a guy on his 3rd Mick Reeves Spitfire, such is his love for them