I'm a second year, and I'll be doing an internship at a bank owned AM this summer, so I'll try to give some good answers, but I imagine there will (hopefully..) be posters who actually work in AM who'll be able to provide much better answers!
Pay - I've actually looked online, and it does seem difficult to find salaries for senior AM positions (the values seem to fluctuate wildly from site to site, so looking online seems unreliable), but my pro-rated summer analyst salary works out to about £37k + £4k relocation, and a lot of websites quote £30 - £40k as a graduate starting salary, so this seems about right.
Obviously the pay is a bit less than what those starting out at IB get, but it isn't that much less, and I think its fair to say that on the whole, the hours are a lot better. I don't know how much management consultants are paid, but I know most big 4 roles start at about £26 - £28k, and the hours are probably similar in AM to big 4. To be honest, whether you go into IB, AM or big 4, you'll probably be making a lot more than most people straight out of uni.
Difference between Bank and independent AMs? I don't think there is that much difference - all AMs will mainly focus on institutional clients such as insurance companies, pension funds, corporate treasuries rather than retail clients, but I feel that banks tend to focus much more heavily on the institutional clients, many of whom also tend to be clients of the investment bank - obviously AMs like BlackRock, PIMCO, Fidelity, Vanguard get most of their business from institutional clients, but they also have a lot more retail offerings - for example it's a lot easier to buy a BlackRock iShares ETF, or put money into a Fidelity ISA than it is for me or you to put money into a Goldman Sachs Asset Management fund.
Difficulty? A lot more people apply for IB positions than AM positions, but there are much much fewer graduate AM positions, so the competition is still intense - you'll need a strong academic record and extra-cirriculars, as for IB.
Is it dull? I don't think so, but I'm biased - keep in mind that a lot of IB positions aren't exactly as glamorous as they seem - most junior IBD analysts won't get that much client exposure, and will spend many long hours working on pitchbooks, reports and on excel spreadsheets. There will also be a lot of 'grunt' work as a junior in AM, but as there are fewer people in AM (there were only 5 summer interns in AM at the bank I'm working at this summer), so i imagine that you'll get responsibility sooner.
Hope this helped!
.