Which is the most acquisitive sector?

Rabbit

Structurally mining and O&G have to be up there. You're constantly replenishing / optimizing your portfolio, scaling across geographies and sometimes moving downstream. There are also funky financing and non-control structures. 

Is banking good in these sectors?

Solid pick. Another structurally active sector. 

Analyst 1 in IB-M&A

I'd like to see the stats before piling in but I'd make a case for FIG - you're having a lot of bank consolidation within Europe and the big commercial banks trying to expand / pivot into the last remaining high-growth areas of Europe (CEE and Southern Europe). Away from bank mergers, expected rate cuts (though on hold) will cause NIM compression and banks are trying to diversify income streams so looking to acquire asset / wealth management businesses that are seeing strong strategic and US PE interest. Insurance broking (dull af in my mind) is also sparking a lot of big tickets from PE. Within the US, regional / state banks are becoming takeover targets, though a non-US buyer will probably have to play a premium; its more likely JPM / Wells etc hoover up a few more, European ownership of US banks never historically plays out well. A lot of this will be politically / regulatory dependent; the US is deregulating and reducing capital requirements, whereas the EU and particularly Switzerland is increasing requirements ahead of Basel 3.1.

Seconded, lot of consolidation especially more recently at stock-level purchases.