It’s one of the hottest debate topics egg-chasing has to offer.
Given we live in something of a green goldfish bowl on these Irish shores, there’s no harm getting input from elsewhere.
And so we have the HarpinOnRugby Lions Selector Panel, made up of one fan from each nation, with even the Irish panellist based abroad.
Well, what better time to be up for my turn than this week? The critics of the 6 Nations were put back in their box last Saturday. The home nations paired off to produce two excellent games.
In as much as some players made strong cases for inclusion, I feel that a number of players demonstrated sound reasons for their replacement. There will be English and Scottish fans that believe the other two nations would be lucky to field anybody after Wales' lacklustre start and Ireland's fit of panic.
However I would select:
15 Kearney - the guy oozes class, is rock solid and an attacking threat.
14 Halfpenny - if in doubt look at his try and his tackle on O'Brien. His kicking is a massive asset.
13 BOD - do you really need me to tell you why?
12 Tuilagi - the toughest choice. Twelvetrees and Scott were excellent and are hard on his tail.
11 Zebo - it's nice to see that Rugby is still a game which reveres individual skills. That kick and catch was sublime. He has 'it'.
10 Farrell - Mr Dependable, but also showed excellent vision for Parling's try. Sexton didn't do much wrong, but he needed to rally Ireland when Best went off. He didn't.
9 Youngs - Lancaster has moulded his erstwhile prima donnas into Grand Slam contenders. He has maturity, a good pass and pace.
1 James - the best scrummaging loose head around.
2 Best - in magnificent form.
3 Cole - not just excellent in the scrum, is a decent operator at rucks and mauls
A note here. On the bench you will see another fine scrummaging front row for second half impact.
4 Gray (c) - there may be better second rows, but for Australia you need this sort of athlete.
5 Launchbery - at the heart of an excellent English front five.
6 Wood - he is timing his rise to prominence beautifully. He wrecked Scottish resistance very effectively and showed a turn of pace on the ball.
8 Beattie - big, strong and quick. Showing the influence of playing in France.
7 Haskell - a cameo performance but its clear that he is excellent in the tight game he didn't used to bother much with. Another big success for Lancaster.
16-23 Sheridan, Youngs, Jones, Ryan Jones, Tipuric, Phillips, Sexton, Hogg.
As to other players, I think that Owens, Robshaw, Twelvetrees, Brown, Scott, McCarthy and Ryan made big cases for inclusion in the wider squad.
Hywel (@HywelV2) is head Rugby writer on the v2 Journal. A bundle of contradictions, he is a Solicitor and Farmer, a Scarlets supporter and a "conservative, forward orientated typical blydi prop".
This latest selection has made some changes to the Composite XV…follow this link to see how it shapes up. Next week it’s the turn of our Scottish panellist Kirsten Bruce.
