Ok, everyone will tell you what works better for them. Everyone website, markets, blasts and approach is different. I have paid Senux, MS, UD, and other software looking always for the best results. My review is solely based on the markets I work witch are not saturated by spam as they are not your generic markets that contain get rich scheme. Some of the markets I worked with are high end luxury, not every one play in those.
Senuke was the best bad boy in the market and Senuke X actually made a statement we are a serious force to not mess with. From this point in time new tools where born one of them been SERobot witch was a direct copy of SenukeX. UD and MS also where born trying to untap in this market. Senuke X devs having so much ground tought they had the winning hand no one could touch them. They took for ever to come out with Senuke XCr, by the time they launched UD, MS and others took advantage of the new things in the market.
So as for today Senuke XCr is expensive and tools likes GSA could do the same for less. Senuke X brought innovation like the diagram designer, but Senuke XCr was fall short. Yes, it still sells because many think the more expensive the better, and in this case they are wrong. Senuke X was overused, and without an update it exposed for so long the footprint. The devs know this and they are trying to get what ever is left of Senuke XCr and exploit it to the max. They actually started to put their eggs in a new basket, they are working on something new and different. I get more emails from then in the new tool than from Senuke XCr itself.
Xrummer is different, it's a powerful tool that requires time and devotion. Once you get a flow going then you can jump to other things. Xrummer is so powerful that a noob can get a site ban within one day. The freedom that it gives you to do things are lethal on nooblets hands. If you can afford it, and have the time, nothing like it.
UD (ultimate demon) a great approach in creating a hybrid from Senuke X. This is actually a good attempt from Edwin's Soft in creating the next version of Senuke X. The tool is descent, and for small scale it's awesome. But the harvester can use some more attention from ES as well as the process. Once you build a huge list of site to blast the application will gag. I hope in the future they make it better, if you are doing 1, 2, maybe 5 sites and don't require a lot of power UD is at a good price.
MS (magic submitter) I personally like this one for various factor. Alex is amazing on answering when there is an issue with the software, the Q&A sessions every now and then are a great help to develop the software and to keep you fresh and motivated on using this tool. But besides that, I require more power on harvesting to create uniqueness. It has many of the cool stuff Senuke X introduce to the market, so I still have the Senuke X feel, but MS has aimed to be a more ethical tool and uses their own spinner witch is ok, but I have TBS why use another. For the price it beats up UD and Senuke XCr, I invite you to go and attend a Q&A live session.
Lacrois AIO - I have not try this, I began to download it and while download was on it's way I notice it was kinda slow. I decided to check and was their connection to mine. It could be the server providing the download was lag or slow. But this turned me off. Imagine if the download server is slow and the software is new how good would be the connection. I moved away from it. It sounds great, cool features, but many of the data resides on their server, me no want lag!
GSA - Oh this nifty tool. I took the 5 day trial, happy there was something new on the market, and people are giving it good reviews. I download and install, been working with other tools I understand many of the terms they where using, but some of the other things I was not so sure how they will come into play for something in particular. But any ways I give it a go. After 2 days of using it, I decided to check the links, the quality, for my findings OMG WTF @#%!&^@ trash links. It's not a bad tool to farm T3/T4 links. But for $$ site is a no no. At least this from the demo, it might be better if you purchase I don't know.
So for me my choice was MS, because it pushes beyond just crappy link farm, and massive link farm but helps you do quality and you can actually show good links to your customers.