Types of IB analyst??

Neither equity research nor regulatory analysts are IB analysts. The only IB analysts are IB analysts. As to types, that depends on the shop. Some have a generalist model, others have a group based model.

As the name implies generalist means you work on whatever comes through the door. That has its pros, namely you see a lot of different things if you're at a shop with good flow, but you don't build up as much depth as you would covering an industry.

Group based usually breaks down into product and coverage. Coverage is covering an industry like chemicals or healthcare. Products are things like M&A, lev fin and debt capital markets. Which is better depends on the bank. Lev fin and M&A generally model more, but if the bank doesn't use balance sheet or sucks at winning M&A mandates they may well take a back seat to coverage. You do get to learn more about your industry but at the cost of less breadth of experience.

Prestige/pay vary by bank, it's better to be in a group with solid deal flow and culture than to try and decide by focus. E.g. I'd rather be at GS FIG with admittedly limited interest in financial institutions IB than be doing M&A, a nominally more prestigious group at some no name bank.