I had an FT-270 for a year or so and it is a very solid, dependable handheld. Like a brick. Obviously monoband, so you’re looking at 2m only, but unless you like accessing repeaters or are sold on 70cm then it is a compromise (just don’t let Viki @M6BWA hear me say that ) - chances are you’ll work the same folk on 70cm that you do on 2m, unless you get into SSB which is a different game entirely, and can be very addictive.
Take heed of @G4OBK Phil’s comments - they are based very much in reality compared to the idealized vision of SOTA that I had in my head when I started out. Horses for courses is right. For example the extra grunt of a compact, lightweight 20w-40w mobile transceiver definitely makes a difference over a handheld, but then you need to worry about batteries that can drive them at 13.8v (think LifePo4) and the extra inconvenience that entails.
On a beautiful, calm, sunny afternoon you could have a lot of fun, but on St Sunday Crag with a biting Easterly wind trust me an FT-270 with the standard whip or possibly pushing your luck, an RH-770 (you got to get your hands out of the gloves to put that on!) will be your friend.
Best of luck, it’s all about experimentation this hobby, do lots of it but be prepared to fail a lot too. Choose deliberately to be stubborn minded, ignore advice and go down your own route - you just might find something that works the best for you! Be prepared to refine things incrementally when you find something that works to make it something great. Also note that other folk have done that as well, there is lots to learn from those who have been before.
Oh, and I’ll just add, you can have handheld turned on all the way up and down to a summit, so will catch additional traffic over a rig that needs setting up.
Regards, Mark. M0NOM