Help! Quick question about groupsets.

[missyR]

Hey there,
I'm recovering from microfracture on my knee and looking to throw myself into cycling when i'm allowed. To give myself a wee incentive I'm looking at getting a new bike but confused with all the different groupsets and whether to go for a triple or compact. It may be worth noting I've previously had mosiacplasty on the same knee so keen to avoid as much strain through the knee as possible.

Any advice?

ps looking at a Ribble Sportive Bianco