Choosing targets is part of putting the ability on the stack and rolling the d20 happens later, as the ability resolves
That makes it hard to anticipate whats coming, requiring a more adaptive strategy
In terms of popularity, the Borderless Surge Foil is shoulders above the rest, but the Normal print is also exceedingly popular right now according to TCGPlayer, and still one of the top 20 cards players have been chasing since the new set released
and the special set premium that these mid-generation expansions tend to carry, as their limited availability and curated card pools make them feel more exclusive than standard main sets
Its first printing in Legions is by far the most common source, but it's old and there are fewer and fewer Synapse Slivers with each passing day
Returning to the battlefield is nice as well, and I could see this getting Skullclamp attacked to it frequently