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What doesn't make sense to me with Gnomes is that they would get a CON bonus, to begin with. Dwarves are obviously stout, but have you seen the drawing of the common Gnome in the Core book?
+INT, +CHA, -WIS makes the most sense to me for Gnomes.
+Con seems like a holdover from the stouter Gnomes of earlier editions (and seems even less on-theme now that they have ties to the fey, the creature type with the smallest HD).
There's also the muddle that Gnomes have been very different over different editions. Pre-3rd edition, and once again in 5th edition, they had high Intelligence and were associated, through the Dragonlance Tinker Gnomes, with clockwork, crafting and contraptions. In 3.5, for a few brief years, it was 'favored class Bard' and, while they didn't have a Charisma bonus, that certainly would have felt appropriate. And now they are associated with the fey and nature, more like the 'Forest Gnomes' of previous editions, and less like the 'Rock Gnomes' (aka, Dwarf-lite).
As I tend to prefer not to close doors on flavors already introduced, I'd go for the Gnome attribute modifier to be +2 Intelligence *or* +2 Wisdom *or* +2 Charisma, and no physical attribute modifiers at all. They'd be stronger (wiry little bodies!) than Halflings and most other Small races, but not as nimble as many of them (Halfling, Goblin, Kobold) tend to be, and with a completely average Con score. Unlike Elves or Dwarves, who may have subraces or castes or different attribute arrays because of being forsaken or Sovyrian or whatever, Gnomes would have no genetic component to their attribute bonus. Two gnomish tinkers with +2 Intelligence might have a kid who has a +2 to Wisdom and goes into Druidism, or +2 Charisma and takes up inspiring oratory as a wandering Bard or awakens a knack for fey Sorcery.
So folk who want to play Gimble the 3.5 Iconic Gnome Bard, can do so with a shiny +2 Charisma modifier, while those who want to play Nebbin, the 3.0 Iconic Gnome Illusionist, can have their +2 Intelligence, and those who want to play Lini, the Pathfinder Iconic Gnome Druid, can have a +2 Wisdom.
No burning need to close any of those doors.
Some gnomes can be tinker-y, or book-totin' arcanists, others can sing and perform and practice fey sorcery, and yet others can get all woodsy and spiritual and turn into bears and eat faces. Not even a need for sub-races like 'Rock Gnome' and 'Forest Gnome,' or City Mouse and Country Mouse.