1) H3-60 has a totally different sponge from H3-37°. H3-37° has a regular, orange H3 sponge in 37° hardness. H3-60 has a springier sponge (called #60), the same as is used with the Tinarc rubbers (I think). I haven't seen H3-60 available anywhere for a few years now, so you may not be able to find it unless you go to China. There's another rubber called Skyline 3-60 which is commonly available and is probably the closest to H3-60 that you can find easily. I don't know how it plays, though.
2) They are not the same rubber but both should be good for looping, as expected from H3.
3) I haven't used enough rubbers to make a judgement on the throw angle of H3-37° compared to the average. However, this question really just seems like an extension of question 2, so see the answer for that. The throw angle of H3-37° is similar to regular H3-neo but it may be a little higher due to the softer sponge.
4) The durability depends on you. How picky are you? I've used one sheet of H3-37° regularly for about a year and was OK with it, though performance suffered towards the end. Some people probably would have thrown it out after 3 months. As is natural, it will lose some tackiness over time. It loses a lot of tackiness in the first week, but that is good. It's too tacky straight out of the package. After the first week, it stabilizes and stays at roughly the same level of tackiness for a while, though it still loses some over time. My 1 year old sheet of H3-37° is still somewhat tacky, though it has lost the grip in the places where the ball bounces the most and the sponge has been worn out in the middle. If you are only spending 20 euro on the rubber and are a casual player, it won't hurt to buy it and try it out and see how long you can use it. If it doesn't last, you only lose 20 euro compared to 60+ for some other rubbers.
5) I will avoid answering this because my definition of a "slow" blade is probably very very different from most other people's definitions.
6) I've never used the rubbers you've listed but my opinion is that H3 is a good rubber and there's not much point in spending more for a better rubber (which might just be a better tier of H3) if you're a casual player. However, there are many different types of rubber, and H3 may not be the best type for you. The other rubbers you listed are very different from H3. It's up to you to find out which type works best for you and your playing style. You can try out other people's rackets or buy lots of rubbers if you have money to burn. It takes some time to figure out what you like best.
7a) I don't know about forehand since I use my H3-37° on the backhand, but in my experience it can chop pretty well. It's definitely very different from chopping with other rubbers, though. It will take some practice to get a consistent chop with H3, or any offensive oriented rubber for that matter. I find that you can get lower, more dangerous chops with H3 than something like Tenergy, but that may just be because I almost never use anything besides H3. I do use H3 on the forehand as well, but it's 41°. I very rarely chop on the forehand but it works fine if I do.
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