Citrix provides remote access solutions for more than 260,000 organizations and over 100 million users around the world. Many law firms (mine included) use Citrix, and Citrix provides users with a free Citrix Receiver app that they can access their work environment even when they are out of the office. I see that I've never posted a formal review of the Citrix app, but I use it somewhat frequently, and it works well for those times when I need remote access to software that only works on Windows or that requires you to be within the work environment. I like using the virtual mouse mode in the iPad app that makes it easy to get the cursor exactly where you need it, making it easier to tap small buttons.
With so many Citrix users, Citrix is able to compile some statistics on who uses what platforms in which industries. Citrix just released its Enterprise Mobility Cloud Report for Q4 2012, which you can download here (PDF format). Not every law firm uses Citrix, of course, and I suspect that there are more Citrix users in medium size to large law firms than smaller law firms. Thus, it would be a mistake to extrapolate any data from Citrix to all lawyers. Nevertheless, Citrix is quite popular, so the statistics do tell you something.
So what are the statistics? In some industries, such as transportation and utilities, Android is currently the preferred platform. But in the legal (and insurance) industries, the iOS platform is by far the preferred platform. Specifically, about 98% of Citrix mobile users at law firms are using iOS. Here is a chart from the report (click to enlarge):
To be honest, I was surprised that the number was that high. 98% for the legal services industry is a pretty overwhelming statistic. However, the Citrix numbers are consistent with what we see from other surveys and estimates — namely, that the iPad is by far the tablet device of choice for lawyers.