Surprisingly perhaps, the recent Andy Serkis narrations of The Hobbit unabridged and the Lord of the Rings (plus Appendix A, and the introduction to B) are I believe the only English language versions apart from those by Rob Inglis.
So how does Serkis compare with Inglis?
Both are very good, but different enough to be complementary.
Serkis takes the reading more slowly, speaks more emphatically, and there is more light and shade - both humour and horror come out more strongly. In a word: Serkis is more exciting.
Inglis's is a more integrated reading, and he reads more correctly in terms of getting across the meaning by intonation and correct emphasis - by contrast, Serkis often emphasizes the wrong word in a phrase or description - especially over-doing the adjectives.
As for the songs or poems - both do these unaccompanied. Serkis sings with a natural bass-baritone voice, Inglis with a trained, higher baritone.
In general, I don't much like the tunes either of them use, and neither do justice to the 'high style' elvish songs; but Serkis does some of the folkier hobbit songs quite convincingly.
What about the different voices of characters? Consistent with the above, Inglis's characters are not so starkly differentiated as Serkis.
It seems clear that Serkis has modelled some of the character voices on the actors he worked with in the Peter Jackson movies; for instance, he does Merry as 'Mummerset' and Pippin as Scottish - which are fine, but neither of which I would regard as correct!
Serkis as Gollum is simply perfection, and will never be surpassed.
On the other hand; I was not convinced by Serkis having Boromir, Denethor and Faramir speak in Yorkshire dialect - which does distinguish Gondor from Men of Rohan and Bree; but which seems to owe more to Sean Bean than to their situation as the three highest status Men in Middle Earth.
And the Gondorian soldier Beregond and his son Bergil are given Ringo Starr-esque Liverpudlian accents - which grated on my ear.
Yet these are minor quibbles - and in general the range of character voices represent a tour de force by Serkis.
In conclusion; I prefer and would recommend Rob Inglis as the best option for the serious, repeated, adult Tolkien listener.
But I have no doubt that Serkis would be a better choice for younger and first-time listeners - and, at his best Serkis allows himself time, and possesses the energy and concentration, to scale the heights and plumb the depths of these great works.
And the ideal is - of course - to own both!